Subject

    Quantitative Aptitude

    Topic

    Speed & Distance

    Length of a train is 250 m. It crosses a pole in 10 second. Find the speed of a train.

    ক)
    60 km/hour
    খ)
    70 km/hour
    গ)
    CND
    ঘ)
    80 km/hour
    ঙ)
    None of these

    Explanation

    ∵ the length of pole will be negligible in comparison to that of train. ∴ Speed of train = lengthoftraintimetaken\frac{{{\rm{lengthoftrain}}}}{{{\rm{timetaken}}}}   {∵Speed=DistanceTime}\left\{ {{\rm{\because Speed}} = \frac{{{\rm{Distance}}}}{{{\rm{Time}}}}} \right\} =250/10 = 25 m/s =25×185km/hour= 25 \times \frac{{18}}{5}{\rm{km}}/{\rm{hour}} ∴ Speed of the train = 90 km/hour.

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