Question
A man can row 12 km/hr in still water. If the speed of
the current is 4 km/hr, it takes 5 hours more in upstream than in the downstream for the same distance. The distance isSolution
Let the required distance be x km. Therefore, x/(12 – 4) – x/(12 + 4) = 5 ⇒ x/8 – x/16 = 5 ⇒ (2x – x)/16 = 5 ⇒ x = 5 x 16 = 80 km
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