Multiple Choice Questions on A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds It 39 s length is n........... for CDS Exam Preparation

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Multiple Choice Questions

A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds It 39 s length is n...........

Quantitative Aptitude (CDS) Problems on trains
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    A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. It's length is?

    50
     

    Incorrect Answer

    150
     

    Correct Answer

    200

    Incorrect Answer

    230

    Incorrect Answer
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    Explanation:

    Let the length of the train be x metres and its speed be y m/s.
    Then, (x/y)=15
    y=x/15
    (x+100)/25=x/15
    15(x+100)=25x
    15x+1500=25x
    10x=1500
    x=150m

    By: bhavesh kumar singh
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