Question

    A man can row 25/2 km an hour in still water and he finds that it takes him thrice as long to row up as to row down the river. The rate of stream is:

    A 12.5 km/hr Correct Answer Incorrect Answer
    B 6.25km/hr Correct Answer Incorrect Answer
    C 8.5 km/hr Correct Answer Incorrect Answer
    D 18.25 km/hr Correct Answer Incorrect Answer
    E 4.5 km/hr Correct Answer Incorrect Answer

    Solution

    Let the rate of stream be x km/hr Then, Speed of downstream = `(25/2) + x` km/hr Speed of upstream = `(25/2) - x` km/hr (12.5 + x) = 3 (12.5 - x ) 12.5 + x = 37.5 - 3x 4x = 25 x = 6.25 km/hr

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