Question
A man can row 10 km/hr in still water. If the speed of
the current is 2 km/hr, it takes 3 hours more in upstream than in the downstream for the same distance. The distance isSolution
Let the required distance be x km. Therefore, x/(10 – 2) – x/(10 + 2) = 3 ⇒ x/8 – x/12 = 3 ⇒ (3x – 2x)/24 = 3 ⇒ x = 3 x 24 = 72 km
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