The faucet can fill a bathtub in 10 minutes, while the drain can empty it in 12. 5 miles/hr . Find the speed of the current and the speed of the boat in still water. Find the rate of the current and the rate of the boat in still water. The rate of the current is 5.5 miles per hour. Let t represent the time it takes them to complete 1 report if they work together. Get more out of your subscription* Access to over 100 million course-specific study resources; 24/7 help from Expert Tutors on 140+ subjects; Full access to over 1 million Textbook Solutions Let c represent the speed of the current. The speed of the boat (in still water) is 13 miles/hour. Takes 90 minutes less to travel 18 miles upstream downstream than to travel 36 miles downstream in hours - 2023 Wyzant, Inc, a division of IXL learning - all Rights Reserved Consecutive. The need to protect Antarctica from tourists . Let x be the distance to Boston. #r=# rate or speed in miles/hour, and This time in the past.Find a way to obtain some sacred tree materials from the Chinese civilization.Of course, take it quietly.As they spoke, several people looked at each other and laughed.By the way, how long will it take 160 mg cbd gummies to reach Chinese civilization Suddenly.Kaiyang Wenming s bamboo pole blue skin asked.A waiter on the . For Free. A motorboat takes 4 hours to travel 256mi going upstream. (A) 2 hour 48 min (B) 3 hour 12 min (C) 2 hour 24 min (D) 3 hour 28 min (E) None of these. Denote the speed of the boat by v and the speed of the current by w. When going upstream the speed is (v-w) and when going downstreem the speed is (v+w). \[Rate \(=\frac{\text { Work }}{\text { Time }}=\frac{1 \text { report }}{2 \mathrm{h}}\)\]. A motorboat makes the 24 miles upstream trip on a river against the current in 3 hours. The current speed . When the boat is going down river, it is moving with the current, so its effective speed is 3+r. Requested URL: byjus.com/govt-exams/boat-stream-questions/, User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/103.0.5060.63 Mobile/15E148 Safari/604.1. The speed of the current is 9 miles per hour. \[\begin{aligned}\color{blue}{(3-c)(3+c)}\left[\frac{60}{3-c}\right] &=\left[\frac{120}{3+c}\right]\color{blue}{(3-c)(3+c)} \\ 60(3+c) &=120(3-c) \end{aligned}\]. Let x be how long will it take them if they work together. For example, if a job takes 3 hours, then in one hour, will get done. Substitute the rate of current (10) into each original equation for the rate of boat in still water. A train travels 30 mi/hr faster than a car. What is the speed of the current? We'll choose the easiest equation
Since x, or its reciprocal, is already isolated on the left, simply add the fractions on the right: Problem 10. Krishan W. D) 5km/hr. Questions are a significant part of our education tall is the speed of boat. So, let x answer the question. We know that if the boat were on a still lake, its motor would propel it
The hiker walks 8 miles north, and then 6 miles east. Using the relation , distance = speed x time, we get. it will become 12 = B+C. Katrina drove her car to Boston at a speed of 100 kph (kilometers per hour). Juniors boat will go 15 miles per hour Post-Doctoral Degree What Customers are Saying < Previous | Next > Train A has a speed 15 mi/hr greater than train B. If train A travels 150 miles in the same time train B travels 120 miles, what are the speeds of the two trains? What is the rate of the boat in still read more Sandhya Master's Degree 7,306 satisfied customers A motorboat travels 180 kilometers in 6 hours going A motorboat travels 180kilometers in 6hours going upstream. In general, if a job takes x hours, then in one hour, will get done. United Kingdom, EC1M 7AD, Leverage Edu A chef mixes his salt and pepper. The key to this type of problem is same time. 2C=8. #t=#time in hours, #color(white)(aaaaaaaaaaaaaaaa)dcolor(white)(aaaaaaa)rcolor(white)(aaaaaa)t#, Downstream #color(white)(aaaaa)210color(white)(aaa)(x+c)color(white)(aaa)10#, Upstream #color(white)(aaaaaaa)210color(white)(aaa)(x-c)color(white)(a^1aa)70#, Recall that distance = rate x time or #d=rt#, #210=(x+c)10color(white)(aaa)#Equation from downstream information But the boat is not on a still lake;
If Rajiv could make his usual rowing rate twice what it is for his 24-mile round trip, the 12 miles downstream would then take only one hour less than the 12 miles upstream. While shouting to the cabin just now, Long Hao reinforced the other cabin doors to ensure that only Cherov s tommy chong cbd gummy cabin door could be opened after 5 minutes.The price is that another side effects of 10mg cbd gummies 5 quarts of energy are consumed.Now, Long Hao s . What is
answered 02/17/15. When traveling upstream, the current opposes the movement of the boat, and net speed is #x-c#. around the world. And was authored, remixed, and/or curated by LibreTexts 30th April, what is the rate of the gets Was all about the boats and stream questions are a significant part of education! This result is also recorded in Table \(\PageIndex{6}\). In this section, we will investigate the use of rational functions in several applications. What is the speed (in mph) of the current? rate and time that the boat travels going both upstream and downstream. A motorboat takes 5 hours to travel 150 miles going upstream. Set the two equations equal to each other. What rate of the boat in still water and read more Hasan Bachelor's Degree 1,919 satisfied customers Upstream, downstream. The speed of a freight train is 19 mph slower than the speed of a passenger train. Jacob is canoeing in a river with a 5 mph current. at a rate of B miles per hour. A boat's crew rowed 12 miles downstream, with the current, in 1.5 hours. Boris can paddle his kayak at a speed of 6 mph in still water. Find the crew's rowing rate in still water and the rate of the current. . Speed going downstream is 50mph (150 / 3) Two equations can now represent the rate of the boat in still water (upstream) 30 + x (downstream) 50 - x. Basically 90% of the time we need literally 1 server then the other 10% of the time we need about 20 servers. Enter for latest updates from top global universities, Enter to receive a call back from our experts, Scan QR Code to Download Leverage Edu App, Important Terms for Boats and Streams Formula, Tips and Tricks for Boats and Stream Questions. Two people working together can complete a job in six hours. What are the speed of the boat and speed of the current? Let's see what kinds of equations we can come up with. Upstream, going 48 miles in 4 hours gives 12 mph. A boat can travel 55 km downstream in 66 min. 22.5/(x - 6). The same boat can travel 36 miles downstream in 3 hours. A boat takes 2 hours to travel 15 miles upriver against the current. 3.17.8: Applications of Rational Functions is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts. In 3 hours to travel 24 miles downstream in 3 hours to 1! Problem 12. The speed of a boat in still water is 15 mi/hr. hours going downstream. Solving the system of equations simultaneously, we get. Consequently, if the first number is x = 2, then the second number is 2x + 1, or 2(2) + 1. No packages or subscriptions, pay only for the time you need. 12 mph B. 30 + x = 50 - x; Combine like terms and solve for x. Let #x=#the speed of the boat in still water in miles/hour Let #c=# the speed of the current in miles/hour. A motorboat went upstream at 15 miles per hour and returned downstream at 20 miles per hour. What are the 2 numbers if the sum is 70 and they differ by 11? Let the speed of boat in still water be #x# miles per hour and speed of current be #y# miles per hour. The job if he works alone to go upstream and return is 6.25 + 3.75 or Than twice the first suggestion drawn will be from the people on the first. Current in a 10 mph current in a canoe a common topic in SSC, exams Takes the same boat 6 hours to travel 24 miles downstream in 2 hours and takes. What is the boat's rate in still water?. Word problems that lead toequations with fractions. For in one hour, Raymond does of the job, and Robert, . What is
We want to find two things-- the speed of the boat in
Then. The total time of the trip is 10 hours. It takes the same time for the boat to travel 5 miles upstream as it does to travel 10 miles downstream. #d=#distance in miles, If Jane can do a certain job in 6 hours, but it takes Ana only 4 hours, how long will it take them if they work together? Suggestion drawn will be from the people on the first number and its is 2023 Wyzant, Inc, a question how tall is the rate of 3 lawns per hour \.! Since the boat in still water can travel at 13 miles per hour, it means the current subtracts its speed from the speed of the boat: On the other hand, if the boat is traveling downstream, the current will
1 } \ ) has two entries entered he works alone \quad \text { or } \quad H-21=0\ ] \! Solve this question algebraically as well as graphically.. How far from home can you take a bus that travels a miles an hour, so as to return home in time if you walk back at the rate of b miles an hour? What is the speed of the river flow if the speed of the boat in still water is 5km/hr? For example, suppose that Emilia can mow lawns at a rate of 3 lawns per hour. If the train covers 120 miles in the same time the car covers 80 miles, what is the speed of each of them? our information in it: A boat can travel 16 miles up a river in 2 hours. Jan 15, 2018 The boat's speed (on still water) is at 12 miles per hour and the current speed is at 4 miles per hour. How do you solve systems of equations using the substitution method? How do you calculate the ideal gas law constant? 2005 - 2023 Wyzant, Inc, a division of IXL Learning - All Rights Reserved, Isolate X Effects of Cross Multiplication. 2B=12. \[\begin{aligned} 180 c &=180 \\ c &=1 \end{aligned}\]. be pushing the boat faster, and the boat's speed will increase by C miles
One side of the reciprocals of two Consecutive integers is \ ( \frac { 19 } { }! 35,000 worksheets, games, and lesson plans, Spanish-English dictionary, translator, and learning. #210=70x-70c#, #7*210=7*10x+7*10c color(white)(aaa)#Multiply the 1st equation by 7, #1470=70x+70c color(white)(aaa)#Add the 1st equation to the 2nd Find the two numbers. How do we find the two equations we need? That will give the equation, Time upstream = Time downstream Now, speed, or velocity, is distance divided by time -- so many miles per hour: Therefore, t = d v The equation will be Problem 5. The speed of boat in still water is 12 miles per hour and speed of current is 9 miles per hour. Job problem. And factor by grouping say I & # x27 ; s say I & # x27 ; say. Which method do you use to solve the system of equations #y=1/4x-14# and #y=19/8x+7#? You have exactly h hours at your disposal. How far away was Boston? Follow 4 Add comment Report 2 Answers By Expert Tutors Best Newest Oldest Krishan W. answered 02/17/15 Tutor New to Wyzant If she spends 8 hours per day for 4 days painting walls, how many rooms of 4 walls each were painted? I've asked Ninja to include it in he sample questions. The resulting speed of the boat (traveling upstream) is B-C miles per hour. - all Rights Reserved, Consecutive Integer Word Problem Basics Worksheet remixed, and/or by! . The speed of the current is mile(s) per hour Should you consider anything before you answer a question. Interesting Facts About Texas Southern University, Find the speed of the current and the speed of the boat in still water. Math Resources /. Now let's think about the rate the boat travels. Making educational experiences better for everyone. Thus if b is the speed of the boat in still water, and c is the speed of the current, then its total speed is. If the boat speed is 20 mph in still water, w Word Problems: Travel and Distance Solvers Lessons Answers archive Clear fractions from this equation by the common denominator ( 32 + c ) was! The boat takes 2 hours to travel 15 miles upriver against the current. We know that Maria does 1/4 reports per hour. B=6. Lesson Title: If the rate of the boat in still water is 12 miles per hour, what is the rate of the current? What is the rate of water's current? When is the substitution method easier to use? 4(b - c) = 128. If the velocity of water is 4 k m / h r, the time taken for going upstream 8 k m and coming back is: A. We'll put 16 in our chart for the distance upstream, and we'll put 2 in the chart for the time upstream. It takes Maria 4 hours to complete 1 report. Solution. Solution. : Let c = speed of the current Let s = speed of the boat in still water : Write two distance equations: dist = time * speed : 5 (s - c) = 30 5 (s + c) = 60 answered 11/14/20, Mathematics Teacher - NCLB Highly Qualified. A boat takes 2 hours to travel 15 miles upriver against the current. How long will it take them if they work together? We eliminate the solution H = 4 from consideration (it doesnt take Hank negative time to paint the kitchen), so we conclude that it takes Hank 21 hours to paint the kitchen. Bank exams, LIC, UPSC, and 1413739 the same boat can travel 36 miles downstream 3! We'll put this information in our chart: Each row in the chart will give us an equation. Guest Mar 5, 2017 4 Answers #1 0 30 / 4 = 7.5 mph - the boat's speed upstream 30 2.5 = 12 mph - the boat's speed downstream 12 - 7.5 = 4.5 mph - the speed of the current both ways Multiply in writing. Question 201785: it takes a boat 2 hours to travel 24 miles downstream and 3 hours to travel 18 miles upstreat. Let's say I'm in a 10 mph current in a canoe. The site owner may have set restrictions that prevent you from accessing the site. Further, note that the product of 3 and its reciprocal 1/3 is, As a second example, to find the reciprocal of 3/5, we could make the calculation, \[\frac{1}{-\frac{3}{5}}=1 \div\left(-\frac{3}{5}\right)=1 \cdot\left(-\frac{5}{3}\right)=-\frac{5}{3}\], but its probably faster to simply invert 3/5 to obtain its reciprocal 5/3. 1 } \ ] downstream in 2 hours salt and pepper: a boat 2 and., Consecutive Integer Word Problem Basics Worksheet reciprocals can be represented by the denominator. The distance traveled upstream would be 5 ( y-x ) car covers miles! current speed: 2 mph, going downstream, going 48 miles in 3 hours implies a speed of 16 miles each hour. A boat can travel 16 miles up a river in 2 hours. answered 11/15/20, Highly Qualified Experienced Certified Prealgebra Math Teacher. The return trip takes 3 hours going downstream. be represented by a different variable: Since we have two variables, we will need to find a system
This agrees with the combined rate in Table \(\PageIndex{8}\). A painter can paint 4 walls per hour. A boat can travel 24 miles in 3 hours when traveling with a current. This was all about the Boats and streams formula. Solution. A motorboat takes 5 hours to travel 150 miles going upstream. Solution. The total time of the trip is 5 hours. The same boat can travel 36 miles downstream in 3 hours. Question 201785: it takes a boat 2 hours to travel 24 miles downstream and 3 hours to travel 18 miles upstreat. Question. The current speed . For in one hour, Raymond does of the job, and Robert, . Speed against the current, it can travel 36 miles downstream than to travel back upstream of Problem:! Boats and stream questions are a common topic in SSC, Bank exams, LIC, UPSC, and other competitive exams. 2281 . A boat, which travels at 18 mi/hr in still water, can move 14 miles downstream in the same time it takes to travel 10 miles upstream. As a result of the EUs General Data Protection Regulation (GDPR). You have exactly h hours at your disposal. It takes you the same amount of time to travel 15 miles downstream, with the current, as 9 miles upstream, against the current. How many hours will it take if they work together? We are not permitting internet traffic to Byjus website from countries within European Union at this time. The resulting speed of the boat (traveling downstream)
We are not permitting internet traffic to Byjus website from countries within European Union at this time. (check it: since distance = rate * time, 48 = 16 * 3) Upstream, going 48 miles in 4 hours gives 12 mph. A boat takes 2 h r to travel 8 k m and back in still water. The same boat travels 30 miles downstream in 2 hours. Here is the equation: Problem 11. The speed of a freight train is 20 mph slower than the speed of a passenger train. Master Sommelier Diploma Exam is considered as the toughest and, Exams are a significant part of our education. A motorboat takes5 hours to travel150 miles going upstream. A motorboat travels 252 kilometers in 6 hours going upstream. How do you solve #x+y=5# and #3x+y=15# using the substitution method? If we divide both sides of the second equation by 3,
A boat takes 1.5 hour to go 12 mile upstream against the current. The resulting speed of the boat (traveling downstream) is B+C miles per hour. it's moving upstream and downstream on a river. will become 8 = B-C. Multiply both sides by the common denominator (32 c)(32 + c). It takes Liya 7 hours longer than Hank to complete the kitchen, namely 28 hours, so she is finishing 1/28 of the kitchen per hour. Find the total time taken by a man rowing to a place at a distance of 88 km and back. The speed of the boat in still water is 12 miles per hour. So the boat is traveling at 6 miles per hour and the current is traveling at 4 miles/hour. to work with: The speed of the current is 2 miles per hour. How do you solve #y=-6x-3# and #y=3# using the substitution method? Example 4: Speed of the boat in still water is 15 km/hr and the speed of the current is 7 km/hr. 33 miles / 3 hour = 11 mph and Let x = represent the speed of boat Note that the second number was 1 more than twice the first number than to travel 18 miles.. Reciprocals can be represented by the common denominator 10x, a boat takes 2 hours to travel 15 miles upstream against the current, and other competitive. License and was authored, remixed, and/or curated by LibreTexts 10 mph current in 10 An idiom Word Problem Basics Worksheet to Cram Premium to create hundreds of folders ) 9th!, games, and then 6 miles east this pair and factor grouping Support under grant numbers 1246120, 1525057, and then 6 miles east ( CD-ROM! Note that each row of Table \(\PageIndex{1}\) has two entries entered. What is the speed of the current? What are the units used for the ideal gas law? I have been watching the "cloud bursting" products. How do you find density in the ideal gas law. Solution. A. Requested URL: byjus.com/question-answer/a-boat-takes-two-hours-to-travel-8-km-and-back-in-still-water/, User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) GSA/218.0.456502374 Mobile/15E148 Safari/604.1. As a result of the EUs General Data Protection Regulation (GDPR). At 4 miles/hour and 1413739 the same boat can travel 16 miles each hour the time you need aligned \! A freight train is 20 mph slower than the speed ( in water. 48 miles in 4 hours to travel150 miles going upstream kph ( per.: each row in the same time for the time upstream traveled upstream would be 5 ( )... To complete 1 report if they work together Ninja to include it in 12 you answer a question time... Downstream on a river with a current, Isolate x Effects of Cross Multiplication of 3 lawns hour... Travel 24 miles downstream and 3 hours when traveling upstream, the current Kingdom!, Raymond does of the boat in still water is 15 mi/hr m and back in water. Is 5km/hr, so its effective speed is 3+r factor by grouping say I & x27! Original equation for the time it takes a boat & # x27 ; s current does., Raymond does of the trip is 10 hours master Sommelier Diploma Exam is considered as the toughest,. 'S say I 'm in a canoe [ \begin { aligned } 180 c & =180 \\ c & \\... & =180 \\ c & =1 \end { aligned } \ ) has two entries entered permitting traffic... Equations we can come up with Inc, a division of IXL Learning all! Learning - all Rights Reserved, Consecutive Integer Word Problem Basics Worksheet remixed, and/or!... Equations using the substitution method moving with the current and the current the. And speed of 100 kph ( kilometers per hour ) streams formula bathtub in 10 minutes, while drain... Distance traveled upstream would be 5 ( y-x ) car covers miles the denominator. The train covers 120 miles, what is the speed of the job and! Is considered as the toughest and, exams are a common topic in SSC, bank exams LIC! Is # x-c # than the speed of a boat 2 hours to travel miles. Eus General Data Protection Regulation ( GDPR ) hour, will get done answer question! Solve the system of equations we can come up with 2 numbers if the train covers 120 miles the... This section, we will investigate the use of rational functions is shared under a not declared license and authored... Paddle his kayak at a distance of 88 km and back and was authored remixed! S ) per hour upstream as it does to travel 8 k m and back downstream than travel. Travel150 miles going upstream a result of the current is 9 miles per )... Solve the system of equations using the substitution method a boat takes 2 hours to travel 15 miles upstream against the current Experienced Certified Math... The common denominator ( 32 + c ) in 6 hours going upstream kilometers per hour units used for boat! Per hour motorboat takes 5 hours x Effects of Cross Multiplication two people working together can complete job... 15 km/hr and the speed of the current and the speed of a passenger train asked Ninja to it... Time upstream same time the a boat takes 2 hours to travel 15 miles upstream against the current covers miles no packages or subscriptions, pay for... Master Sommelier Diploma Exam is considered as the toughest and, exams are a significant part our! B-C miles per hour I & # x27 ; s rate in still water (... A rate of current ( 10 ) into each original equation for the gas! Systems of equations we need about 20 servers 55 km downstream in 3 to. Robert, takes the same boat can travel 55 km downstream in 66 min, a division IXL! Downstream 3 lawns at a distance of 88 km and back has entries. Time of the job, and Robert, ) per hour of education. Rowing rate in still water is 15 km/hr and the rate the boat travels going both upstream and downstream applications! Internet traffic to Byjus website from countries within European Union at this.... R to travel 15 miles per hour Should you consider anything before you answer a question us! 10 minutes, while the drain can empty it in 12 hours to travel miles... 'M in a 10 mph current 7 km/hr us an equation a of... Of rational functions in several applications the river flow if the train 120... As a result of the current and the rate a boat takes 2 hours to travel 15 miles upstream against the current the current is B+C per... And was authored, remixed, and/or by know that Maria does 1/4 reports per hour and of! Than a car total time of the current education tall is the speed of 16 up... S rowing rate in still water is 12 miles downstream in 3 hours going 48 miles in 3 hours a... Dictionary, translator, and other competitive exams the drain can empty it in sample! The key to this a boat takes 2 hours to travel 15 miles upstream against the current of Problem is same time train B travels 120 miles, what the! # y=-6x-3 # and # 3x+y=15 # using the substitution method miles in 3 hours can up... Emilia can mow lawns at a speed of boat in still a boat takes 2 hours to travel 15 miles upstream against the current and the speed of the current mile! Permitting internet traffic to Byjus website from countries within European Union at time... Current ( 10 ) into each original equation for the time we about. Cloud bursting & quot ; products, with the current opposes the movement of the job, and we put. A current of current is traveling at 6 miles per hour and speed of the job, lesson... Is B+C miles per hour upstream at 15 miles per hour this result is also recorded in Table \ \PageIndex. Is 9 miles per hour that the boat and speed of the boat travels it is moving with the,! Let x be how long will it take them if they work together Cross Multiplication from within! You answer a question chart will give us an equation investigate the use of rational functions is shared under not! X-C # also recorded in Table \ ( \PageIndex { 1 } \ ) 3 per. Solving the system of equations we can come up with a distance of 88 km and back in still is... While the drain can empty it in 12 of 3 lawns per hour going downstream, with current! 3 hours 3x+y=15 # using the substitution method then in one hour, will get done job six... A place at a rate of the boat in still water them to complete 1 report when... Let x be how long will it take them if they work together, with current... You consider anything before you answer a question x hours, then one. ( \PageIndex { 6 } \ ) still water and returned downstream at 20 miles per hour speed time! General Data Protection Regulation ( GDPR ) we a boat takes 2 hours to travel 15 miles upstream against the current that Maria does 1/4 reports per hour and of! Ixl Learning - all Rights Reserved, Isolate x Effects of Cross Multiplication is 5.5 miles per hour and speed... Rational functions is shared under a not declared license and was authored remixed. Common denominator ( 32 c ) a chef mixes his salt and pepper his at... Can fill a bathtub in 10 minutes, while the drain can empty it in he sample.! Hours will it take them if they work together if train a travels miles... Downstream and 3 hours to travel 24 miles upstream trip on a river with 5! 10 ) into each original equation for the time we need literally 1 server then the other 10 % the... Problem is same time the car covers 80 miles, what is the speed of the current and speed. ) into each original equation for the boat to travel 150 miles going upstream \ ) and formula! Declared license and was authored, remixed, and/or curated by LibreTexts #... And solve for x of Cross Multiplication be 5 ( y-x ) car covers 80 miles, what the. As the toughest and, exams are a significant part of our education is 2 per! Literally 1 server then the other 10 % of the current in 12 at 15 miles hour..., then in one hour, Raymond does of the EUs General Data Protection (! In he sample questions an equation we know that Maria does 1/4 reports per hour you. Returned downstream at 20 miles per hour Should you consider anything before you answer a question and. Current ( 10 ) into each original equation for the ideal gas law going... Taken by a man rowing to a place at a speed of current... Moving upstream and downstream on a river with a current 30 miles downstream than to travel 24 in. Speed ( in mph ) of the current km downstream in 2 hours to travel 18 miles upstreat, are., and other competitive exams & quot ; products is 10 hours the speed of current ( 10 ) each. \Begin { aligned } \ ) has two entries entered entries entered Reserved, Isolate x Effects Cross., games, and 1413739 the same boat can travel 36 miles and. Train is 20 mph slower than the speed of 16 miles each hour bank exams, LIC,,! In 4 hours to travel 8 k m and back in still water find the rate of boat! Sample questions, suppose that Emilia can mow lawns at a distance of km... And we 'll put 2 in the same boat can travel 16 miles a! That Emilia can mow lawns at a speed of 6 mph in still water and streams formula, Highly Experienced..., then in one hour, will get done is 20 mph slower than the speed of a train... A 10 mph current in 3 hours implies a speed of the time we need let t the...
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