How we calculate the speed of the water of a river, Physics

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A boat can travel at a speed of 3 m s^-1 on still water. A boatman needs to cross a river whilst covering the shortest possible distance. In what direction should he row with respect to the bank if the speed of the water is

(i) 2 m s^-1,

(ii) 4 m s^-1

Suppose that the speed of the water is the similar everywhere.

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