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    Question

    A man can row 15 km/hr in still water. If the speed of

    the current is 5 km/hr, it takes 6 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/(15 – 5) – x/(15 + 5) = 6 ⇒ x/10 – x/20 = 6 ⇒ (2x – x)/20 = 6 ⇒ x = 6 x 20 = 120 km

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