SOLUTION: A man rows downstream at the rate of 5 mph and upstream at the rate of 2mph. How far downstream should he go if he is to return 7/4 hours after leaving?

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Question 1065516: A man rows downstream at the rate of 5 mph and upstream at the rate of 2mph. How far downstream should he go if he is to return 7/4 hours after leaving?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A man rows downstream at the rate of 5 mph and upstream at the rate of 2mph. How far downstream should he go if he is to return 7/4 hours after leaving?
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Downstream DATA:
rate = 5 mph ; distance = d miles ; time = d/5 hrs
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Upstream DATA:
rate = 2 mph ; distance = d miles ; time = d/2 hrs
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Equation:
d/5 + d/2 = 7/4
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Multiply thru by 20 to get
4d + 10d = 35
d = 35/14
distance = 2.5 miles
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Cheers,
Stan H.
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