A man can swim with a certain speed, in still water to cross a river to a point directly opposite to the starting point in time t 0 . When the river flows, he crosses the river directly along the sa

Question

A man can swim with a certain speed, in still water to cross a river to a point directly opposite to the starting point in time t 0 ​ . When the river flows, he crosses the river directly along the same path in a time t 1 ​ . If 'd' be the river width, Then the velocity of water current is :-

TestHub · Accepted Answer

t 0 ​ = V b r ​ d ​ and t 1 ​ = V b r ​ c o s θ d ​ , so cos θ = t 1 ​ t 0 ​ ​ V r ​ = V b r ​ sin θ = t 1 ​ t 0 ​ d t 1 2 ​ − t 0 2 ​ ​ ​ Answer (B)

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