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A man swims to and fro along the bank of a river with speed v relative to water.if vel of flow is u then average speed of the man in to and fro motion is
While going in the direction flow speed is v+u (For relative velocity to be u)While going against the flow, speed is v-uLet distance one side be xTime taken to travel with direction of flow= x/v+uTime taken to travel against flow = x/v-uAvg speed = Total distance by total timesubstitute to get answer.
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