Question

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

Answer 1

Let v₀ be the stream velocity and v' the velocity of motorboat with respect to water. The motorboat reached point B while going downstream with velocity (v₀+v') and then returned with velocity (v'+v₀) and passed the raft at point  C.Let t be the time for the raft (which flows with stream with velocity v₀) to move from point A to C, during which the motorboat moves from A to B and then from B to C.