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    Question

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

    velocity of current is 4 km/hr and it takes him 1 hour to row to a place and come back, how far is the place?
    A 4 km Correct Answer Incorrect Answer
    B 2.25 km Correct Answer Incorrect Answer
    C 9.5 km Correct Answer Incorrect Answer
    D 4.2 km Correct Answer Incorrect Answer
    E 5.25 km Correct Answer Incorrect Answer

    Solution

    Let the distance be x km. Speed upstream = 10 – 4 = 6 km/hr Speed downstream = 10 + 4 = 14 km/hr ⇒ x/6 + x/14 = 1 ⇒ (7x + 3x)/42 = 1 ⇒ 10x = 42 ⇒ x = 42/10 = 4.2 km

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