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    Question

    A train can cross a pole in 30 seconds. While if the

    train increased its speed by 55% then time taken by it to cross 351 metres long platform is 42 seconds. Find the time taken by the train to cross a 130 metre long tunnel.
    A 45 seconds Correct Answer Incorrect Answer
    B 43 seconds Correct Answer Incorrect Answer
    C 39 seconds Correct Answer Incorrect Answer
    D 34 seconds Correct Answer Incorrect Answer

    Solution

    Let speed of train is тАШxтАЩ m/s So, length of train = 30 ├Ч x = 30x metres And, 30x + 351 = 1.55 ├Ч x ├Ч 42 Or, 35.1x = 351 Or, x = 10 m/s So, length of train = 30 ├Ч 10 = 300 metres Desired time = (300 + 130)/10 = 43 seconds

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