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    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 is
    A 48 km Correct Answer Incorrect Answer
    B 80 km Correct Answer Incorrect Answer
    C 120 km Correct Answer Incorrect Answer
    D 45 km Correct Answer Incorrect Answer
    E 35 km Correct Answer Incorrect Answer

    Solution

    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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