Question
A man can row at 8 km/hr in still water. If the velocity
of current is 2 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 = 8 – 2 = 6 km/hr Speed downstream = 8 + 2 = 10 km/hr ⇒ x/6 + x/10 = 1 ⇒ (5x + 3x)/30 = 1 ⇒ 8x = 30 ⇒ x = 30/8 = 3.75 km
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