Question

    A man can row 6 km/hr in still water. If the speed of

    the current is 1 km/hr, it takes 2 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/(6 – 1) – x/(6 + 1) = 2 ⇒ x/5 – x/7 = 2 ⇒ (7x – 5x)/35 = 2 ⇒ x = 2 x 35/2 = 35 km

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