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    Question

    A man can row 12 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 72 km Correct Answer Incorrect Answer
    B 90 km Correct Answer Incorrect Answer
    C 30 km Correct Answer Incorrect Answer
    D 40 km Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the required distance be x km. According to the question ⇒ x/(12 – 3) – x/(12 + 3) = 4 ⇒ x/9 – x/15 = 4 ⇒ (5x – 3x)/45 = 4 ⇒ x = 4 x 45/2 = 90 km

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