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    Question

    A train can cross a pole in 21 seconds. While if the

    train increased its speed by 35% then time taken by it to cross 357 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
    E 35 seconds Correct Answer Incorrect Answer

    Solution

    Let speed of train is ‘x’ m/s So, length of train = 21 × x = 21x metres And, 21x + 357 = 1.35 × x × 42 Or, 35.7x = 357 Or, x = 10 m/s So, length of train = 21 × 10 = 210 metres Desired time = (210 + 130)/10 = 34 seconds

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