A man can row at 4 kmph in still water. If the velocity of current is 2 kmph and it takes him 5 hour to row to a place and come back, how far is the place?
Let the distance be x km. Speed upstream = 4 – 2 = 2 kmph Speed downstream = 4 + 2 = 6 kmph => (x/6) + (x/2) = 5 => (x + 3x)/6 = 5 => 4x = 30 => x = 7.5 km
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