SOLUTION: A paddle boat can move at a speed of 4km/h in still water. The boat is paddled 121km downstream in a river in the same time it takes to go 6km upstream. What is the speed of the

Question 379034: A paddle boat can move at a speed of 4km/h in still water. The boat is paddled 121km downstream in a river in the same time it takes to go 6km upstream. What is the speed of the river? The speed of the river is___km/h
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi,

D = r*t OR t = D/r   Question sets up an equality according to time it takes

Let c represent the rate of the current



cross mulitply to solve for x

121(4 - c) = 6(4 + c)

484 - 121c = 24 + 6c

460 = 127c

3.622kmph = c, the rate(speed) of the current

 

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