SOLUTION: A boat traveled 210 miles downstream and back. the trip downstream took 10 hours and the trip back took 70 hours. What is the speed of the boat in still water? What is the speed of
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Question 807732: A boat traveled 210 miles downstream and back. the trip downstream took 10 hours and the trip back took 70 hours. What is the speed of the boat in still water? What is the speed of the current? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A boat traveled 210 miles downstream and back. the trip downstream took 10 hours and the trip back took 70 hours. What is the speed of the boat in still water? What is the speed of the current?
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Rate downstream:: 210/10 = 21 mph
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Rate upstream::: 210/70 = 3 mph
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Equations:
Downstream:: b + c = 21 mph
Upstream:::: b - c = 3 mph
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Add and solve for "b":
2b = 24
b = 12 mph (speed of the boat in still water)
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Solve for "c"::
b + c = 21
12 + c = 21
c = 9 mph (speed of the current)
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Cheers,
Stan H.
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