Multiple Choice Questions on Train A crosses a vertical pole at the speed of 15 m s in 20 seconds Speed of train A is 3 m s less ........... for SBI(PO) Exam Preparation

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Multiple Choice Questions

Train A crosses a vertical pole at the speed of 15 m s in 20 seconds Speed of train A is 3 m s less ...........

Quantitative Aptitude (SBI-PO) Problems on trains
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    Train A crosses a vertical pole at the speed of 15 m/s in 20 seconds. Speed of train A is 3 m/s less than the speed of train B and length of train B is 30 meter less than length of train A. Find the time taken by Train B to cross 270 meter long platform.

    20 seconds

    Incorrect Answer

    15 seconds

    Incorrect Answer

    30 seconds

    Correct Answer

    45 seconds

    Incorrect Answer

    40 seconds

    Incorrect Answer
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    Explanation:
    Let the length of Train A be L meters, then
    According to question,
    =L/15= 20
    ⇒ L = 300 m
    ∴ Length of train A is 300 m
    So, length of train B = 300 – 30 m = 270 meters
    Speed of train B = 15 + 3 = 18 m/s
    When B crosses a 270 m long platform,
    Time = (270+270)/18seconds = 30 seconds
    Hence, the required time = 30 seconds

    By: Munesh Kumari
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