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    Question

    A man can row 25/2 km an hour in still water and he

    finds that it takes him thrice as long as long to row down the river. The rate of stream is:
    A 6.5 km/hr Correct Answer Incorrect Answer
    B 6.25km/hr Correct Answer Incorrect Answer
    C 8.5 km/hr Correct Answer Incorrect Answer
    D 8.25 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 [(25/2) + x] = 3 [(25/2) - x] (25/2) + x = (75/2) - x 4x = 25 x = 6.25 km/hr

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