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    Question

    A man can row 9 km/hr in still water. If the speed of

    the current is 3 km/hr, it takes 4 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/(9 – 3) – x/(9 + 3) = 4 ⇒ x/6 – x/12 = 4 ⇒ (2x – x)/12 = 4 ⇒ x = 4 x 12 = 48 km

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