Multiple Choice Questions on A motor boat whose speed is 15 km hour in still water goes 30 km down ndash stream and comes back in........... for CDS Exam Preparation

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Multiple Choice Questions

A motor boat whose speed is 15 km hour in still water goes 30 km down ndash stream and comes back in...........

Quantitative Aptitude (CDS) Boats and Streams
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    A motor boat, whose speed is 15 km/ hour in still water goes 30 km down–stream and comes back in a total of 4 hour and 30 minutes. The speed of the

    stream is

    4 km/ hour

    Incorrect Answer

      5 km/hour

    Correct Answer

    6 km/ hour

    Incorrect Answer

    10 km/hour

    Incorrect Answer
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    Explanation:

    Let the speed of stream be ‘x’ km/hour.
    ⇒30/(15+x)+30/(15−x)= 4.5
    ⇒⇒ 225 – x2 = 200
    x2 = 25 => x = 5

    By: Munesh Kumari
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