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Water is flowing in a river of width 36m...

Water is flowing in a river of width 36m with a speed of `2ms^(-1)` .A person in a boat at a point "P" on the bank of the river wants to cross the river by the shortest path to reach a point "Q" directly opposite on the other bank.If he can row his boat with a speed of `4ms^(-1)` in still water,he should row his boat at an angle of ?

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