A man swims to and fro along the bank of a river with a velocity v relative to water. If the velocity of flow is u, the average speed of the man is ((v^(2)-u^(2)))/(NV), where 'N' is ( for to and fro motion )

A man swims to and fro along the bank of a river with a velocity v rel

1.	A man swims to and fro along the bank of a river with a velocity v relative to water. If the velocity of flow is u, the average speed of the man is ((v^(2)-u^(2)))/(NV), where 'N' is ( for to and fro motion )
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