Question
A man can row at 15 km/hr in still water. If the
velocity of current is 3 km/hr and it takes him 1 hour to row to a place and come back, how far is the place?Solution
Let the distance be x km. Speed upstream = 15 – 3 = 12 km/hr Speed downstream = 15 + 3 = 18 km/hr ⇒ x/12 + x/18 = 1 ⇒ (3x + 2x)/36 = 1 ⇒ 5x = 36 ⇒ x = 36/5 = 7.2 km
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