A man can row at 7 kmph in still water. If the velocity of current is 5 kmph and it takes him 7 hour to row to a place and come back, how far is the place?
Let the distance be x km. Speed upstream = 7 – 5 = 2 kmph Speed downstream = 7 + 5 = 12 kmph => (x/12) + (x/2) = 7 => (x + 6x)/12 = 7 => 7x = 84 => x = 12 km
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