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D A river 2 km wide is flows at the rate of 2km h A...

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D A river 2 km wide is flows at the rate of 2km h A boatman who can row a boat at a speed of 4 km h in still water goes a distance of 2 km upstream and then comes back The time taken by him to complete his journey is 1 60 min 2 70 min 3 80 min 4 90 min

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