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    Question

    A man can row at 8 km/hr in still water. If the velocity

    of current is 2 km/hr and it takes him 1 hour to row to a place and come back, how far is the place?
    A 14.4 km Correct Answer Incorrect Answer
    B 4.8 km Correct Answer Incorrect Answer
    C 9.6 km Correct Answer Incorrect Answer
    D 2.1 km Correct Answer Incorrect Answer
    E 3.75 km Correct Answer Incorrect Answer

    Solution

    Let the distance be x km. Speed upstream = 8 – 2 = 6 km/hr Speed downstream = 8 + 2 = 10 km/hr ⇒ x/6 + x/10 = 1 ⇒ (5x + 3x)/30 = 1 ⇒ 8x = 30 ⇒ x = 30/8 = 3.75 km

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