SOLUTION: It took a crew 4 h 30 min to row 8 km upstream and back again. If the rate of flow of the stream was 7 km/h, what was the rowing speed of the crew in still water?

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Question 908797: It took a crew 4 h 30 min to row 8 km upstream and back again. If the rate of flow of the stream was 7 km/h, what was the rowing speed of the crew in still water?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x+y=4.5,
x*(r+7)=8,
y*(r-7)=8
x=4.5-y
(4.5-y)*(r+7)=4
y*(r-7)=4
y*r-7y=4
r=9, x=0.5, y=4