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A motorboat going downstream overcome a ...

A motorboat going downstream overcome a raft at a point A, `tau=60min` later it turned back and after some time passed the raft at a distance `l=6.0km` from the point A. Find the flow velocity assuming the duty of the engine to be constant.

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`v`: Speed of boat with respect to river flow
`u`: river flow speed

`v_(b//g)=v+u` (along the flow)
`v_(b//g)=v-u` (opposite to the flow)
Boat: `AC-CB=6`
`(v+u)xx1-(v-u)t=6`
`t`: time taken by the boat from `C` to `B`
object : `AB=6`
`u(t+1)=6........(ii)`
Solving `u=3km//h`
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