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    Question

    Train тАШAтАЩ running with a speed of 45 km/h crosses a

    pole in 7.5 seconds. If the time taken by train тАШAтАЩ to cross train тАШBтАЩ running with a speed of 54 km/h and coming from the opposite direction is 9 seconds, then find the length of train B.
    A 123.75 metres Correct Answer Incorrect Answer
    B 143.75 metres Correct Answer Incorrect Answer
    C 153.75 metres Correct Answer Incorrect Answer
    D 113.75 metres Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of train A = 45 ├Ч 5/18 = 12.5 m/s Length of train A = 12.5 ├Ч 7.5 = 93.75 metres Let length of train B = тАШlтАЩ metres Speed of train B = 54 ├Ч 5/18 = 15 m/s Relative speed if train A with respect to train B = 15 + 12.5 = 27.5 m/s So, I + 93.75 = 27.5 ├Ч 9 = 247.5 So, l = 153.75 metres

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