Question
A man can row at 20 km/hr in still water. If the
velocity of current is 4 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 = 20 – 4 = 16 km/hr Speed downstream = 20 + 4 = 24 km/hr ⇒ x/16 + x/24 = 1 ⇒ (3x + 2x)/48 = 1 ⇒ 5x = 48 ⇒ x = 48/5 = 9.6 km
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