Multiple Choice Questions on In a stream running at 2 km hr a motorboat goes 10 km upstream and back again to the starting point ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

In a stream running at 2 km hr a motorboat goes 10 km upstream and back again to the starting point ...........

Quantitative Aptitude ( CCS) Boats and Streams
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    In a stream running at 2 km/hr, a motorboat goes 10 km upstream and back again to the starting point in 55 minutes. Find the speed (km/hr) of the motorboat in still water.

    17

    Incorrect Answer

    20

    Incorrect Answer

    22

    Correct Answer

    25

    Incorrect Answer
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    Explanation:

    Distance = time * [B^2 – R^2] / 2*B
    10 =55/60 * [B^2 – 2^2] / 2*B
    B = 22 km/hr

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