A motorboat going downstream overcome a raft at a point A; t = 60 min later it turn back and after some time passed the raft at a distance 6.0 km from the point A. Find the flow velocity assuming the duty of the engine to be constant.
Let the speed of the boat in still water be v (constant due to the engine) and flow speed of water is u.
Speed of the boat down the river relative to ground is v + u and the same up the river is ...
A conceptual question good to learn relative velocity.