📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

    Question

    A man is running at 5 m/sec in the same direction of a

    train. The train crosses him in 5 seconds. If the train’s speed is 90 km/hr, find the time it takes to cross a bridge of 75 metres.
    A 5 seconds Correct Answer Incorrect Answer
    B 6 seconds Correct Answer Incorrect Answer
    C 7 seconds Correct Answer Incorrect Answer
    D 8 seconds Correct Answer Incorrect Answer
    E 9 seconds Correct Answer Incorrect Answer

    Solution

    Train speed = 90 × (5/18) = 25 m/sec
    Relative speed = 25 - 5 = 20 m/sec
    L / 20 = 5 ⇒ L = 100 metres
    Time to cross bridge = (100 + 75)/25 = 175/25 = 7 seconds

    Practice Next
    More Trains Questions

    Relevant for Exams:

    ask-question