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    Question

    A man can row 8 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 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/(8 – 2) – x/(8 + 2) = 3 ⇒ x/6 – x/10 = 3 ⇒ (5x – 3x)/30 = 3 ⇒ x = 3 x 30/2 = 45 km

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