Multiple Choice Questions on If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph then the speed of t........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph then the speed of t...........

Quant (SSC) Boats and Streams
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    If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph then the speed of the boat in still water is:

    4.2 km/hr

    Incorrect Answer

    9 km/hr

    Incorrect Answer

    13 km/hr

    Correct Answer
    21 km/hr
    Incorrect Answer
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    Explanation:

    Rate upstream = (7 /42 x 60) kmph = 10 kmph.
    Speed of stream = 3 kmph
    Let speed in still water be x km/hr.
    Then, speed upstream = (x – 3) km/hr.
    ∴  x – 3 = 10   OR   x = 13 km/hr.

    By: Amit Kumar
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