A man can row at 6 kmph in still water. If the velocity of current is 3 kmph and it takes him 8 hour to row to a place and come back, how far is the place?
Let the distance be x km. Speed upstream = 6 – 3 = 3 kmph Speed downstream = 6 + 3 = 9 kmph => (x/9) + (x/3) = 8 => (x + 3x)/9 = 8 => 4x = 72 => x = 18 km
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