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Multiple Choice Questions

A boatman rows 1 km in 5 minutes along the stream and 6 km in 1 hour against the stream The speed of...........

Quantitative Aptitude ( CCS) Boats and Streams
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    A boatman rows 1 km in 5 minutes, along the stream and 6 km in 1 hour against the stream. The speed of the stream is ?

    3 kmph 

    Correct Answer

    6 kmph

    Incorrect Answer

    12 kmph

    Incorrect Answer

    8 kmph

    Incorrect Answer
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    Explanation:

    Downsteam speed , D = 1 km/ (5/60 h) = 60/5
    = 12 km/hr
    Upstream speed, U
    = 6 km/1hr = 6 km/h
    Speed of the stream,
    (D - U)/2 = (12-6)/2 = 6/2 = 3 km/hr

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