SOLUTION: On a weekend outing, carlos rents a motorboat for 8 hrs to travel down the river and back. the rental operator tells him to go for 3 hrs downstream, leaving 5 hrs to return upstrea
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Question 810512: On a weekend outing, carlos rents a motorboat for 8 hrs to travel down the river and back. the rental operator tells him to go for 3 hrs downstream, leaving 5 hrs to return upstream.
If the river flows at a speed of 7mph how fast must Carlos travel in order to return in 8 hrs?
How far downstream did carlos go before he returned back?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
r*t=d
(r+7)*3=(r-7)*5,
3r+21=5r-35
56=2r
28 mph=r
3*35=105 miles downstream
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