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A man who can swim at a speed v relative...

A man who can swim at a speed v relative to the water wants to cross a river of width d flowing with a speed u. The point opposite him across the river is A.

A

He can reach the point A in time d/v

B

He can reach the point A is time `(d)/(sqrt(v^(2)-u^(2)))`

C

The minimum time in which he can cross river is `d/v`

D

He can not reach A if u gt v

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B, C, D
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