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    Question

    A man can row 10 km/hr in still water. If the speed of

    the current is 2 km/hr, it takes 3 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
    E 105 km Correct Answer Incorrect Answer

    Solution

    Let the required distance be x km. Therefore, x/(10 – 2) – x/(10 + 2) = 3 ⇒ x/8 – x/12 = 3 ⇒ (3x – 2x)/24 = 3 ⇒ x = 3 x 24 = 72 km

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