Multiple Choice Questions on A man rows to a place 40 km distant and come back in 9 hours He finds that he can row 5 km with the ........... for IBPS RRB - Officers Exam Preparation

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Multiple Choice Questions

A man rows to a place 40 km distant and come back in 9 hours He finds that he can row 5 km with the ...........

Quantitative Aptitude(IBPS RRB PO) Boats and Streams
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    A man rows to a place 40 km distant and come back in 9 hours. He finds that he can row 5 km with the stream in the same time as 4 km against the stream. The rate of the stream is.

    1 km/hr

    Correct Answer

    1.5 km/hr

    Incorrect Answer

    2 km/hr

    Incorrect Answer

    2.5 km/hr

    Incorrect Answer
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    Explanation:

    Speed downstream = 5/x
    Speed upstream = 4/x
    40/(5/x) + 40/(4/x) = 9
    X = ½
    So, Speed downstream = 10 km/hr, Speed upstream = 8 km/hr.
    Rate of the stream = 1/2 * 2 = 1 kmph

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