A man can row at 5 kmph in still water. If the velocity of current is 1 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 = 5 – 1 = 4 kmph Speed downstream = 5 + 1 = 6 kmph => (x/6) + (x/4) = 5 => (2x + 3x)/12 = 5 => 5x = 60 => x = 12 km
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