Question
A man can row 15 km/hr in still water. If the speed of
the current is 5 km/hr, it takes 6 hours more in upstream than in the downstream for the same distance. The distance isSolution
Let the required distance be x km. Therefore, x/(15 – 5) – x/(15 + 5) = 6 ⇒ x/10 – x/20 = 6 ⇒ (2x – x)/20 = 6 ⇒ x = 6 x 20 = 120 km
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