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Relative velocity

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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.

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A conceptual question good to learn relative velocity.

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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 ...

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