Question
A man can row at 2 kmph in still water. If the velocity
of current is 1 kmph and it takes him 4 hour to row to a place and come back, how far is the place?Solution
Let the distance be x km. Speed upstream = 2 – 1 = 1 kmph Speed downstream = 2 + 1 = 3 kmph => (x/3) + (x/1) = 4 => (x + 3x)/3 = 4 => 4x = 12 => x = 3 km
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