SOLUTION: A boat can travel at a speed of 20 mph in still water. In a stream that has a current of 5 mph, the boat travels a certain distance down stream and returns. The ratio of the averag

Question 813592: A boat can travel at a speed of 20 mph in still water. In a stream that has a current of 5 mph, the boat travels a certain distance down stream and returns. The ratio of the average speed for the round trip to the speed in still water.
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
b = 20
w = 5
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s = d / t
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u = b - w = 15
d = b + w = 25
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a = (u + d)/2 = 20
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Answer:
a/w = 20/5 = 4
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