Multiple Choice Questions on A boat whose speed in 20 km hr in still water goes 40 km downstream and comes back in a total of 5 h........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A boat whose speed in 20 km hr in still water goes 40 km downstream and comes back in a total of 5 h...........

Quantitative Aptitude ( CCS) Boats and Streams
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    A boat whose speed in 20 km/hr in still water goes 40 km downstream and comes back in a total of 5 hours. The approx. speed of the stream (in km/hr) is.

    6 km/hr

    Incorrect Answer

    9 km/hr

    Correct Answer

    12 km/hr

    Incorrect Answer

    16 km/hr

    Incorrect Answer
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    Explanation:

    Let the speed of the stream be x km/hr. Then,
    Speed downstream = (20 + x) km/hr,
    Speed upstream = (20 – x) km/hr.
    40/20+x + 40/20-x = 5
    X = 9 approx

    By: Pranav Gupta
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