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Q.

The speed of a swimmer is 4kmh−1 in still water. If the swimmer makes his strokes normal to the flow of river of width 1 km, he reaches a point 750 m down the stream on the opposite bank. The speed of the river water is _____  kmh-1

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answer is 3.

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Detailed Solution

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Given VBG→=4kmph

Time taken to cross the river is t=1km4 kmh-1=14hr

drift d=vriver×t=34Km

∴v=3km/hr

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