SOLUTION: A paddleboat can move at a speed of 4 km/h in still water. the boat paddled 14 km downstream in the river in the same time it takes to go 7 km upstream. what is the speed of the r

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Question 519383: A paddleboat can move at a speed of 4 km/h in still water. the boat paddled 14 km downstream in the river in the same time it takes to go 7 km upstream. what is the speed of the river?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
14 / (4 + r) = 7 / (4 - r)

dividing by 7 and "cross" multiplying ___ 8 - 2r = 4 + r