Question

    A man can row 16 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 is
    A 72 km Correct Answer Incorrect Answer
    B 150 km Correct Answer Incorrect Answer
    C 30 km Correct Answer Incorrect Answer
    D 40 km Correct Answer Incorrect Answer

    Solution

    Let the required distance be x km. Therefore, x/(16 – 4) – x/(16 + 4) = 5 ⇒ x/12 – x/20 = 5 ⇒ (5x – 3x)/60 = 5 ⇒ x = 5 x 60/2 = 150 km

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