A paddle boat can move at a speed of 14 km/h in still water. The boat is paddled 20 km downstream in a river in the same time it takes to go 10 km upstream...

Question

A paddle boat can move at a speed of 14 km/h in still water. The boat is paddled 20 km downstream in a river in the same time it takes to go 10 km upstream. What is the speed of the river? 

 

The speed of the river is ___ km/h

Answer 1

Let the speed of the river be x km/h.

20/(14+x) = 10/(14-x)

20(14-x)=10(14+x)

280-20x=140+10x

140 = 30x

x=14/3