New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    A train can cross a pole in 24 seconds. While if the

    train increased its speed by 50% then time taken by it to cross 234 metres long platform is 42 seconds. Find the time taken by the train to cross a 126 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 ‘x’ m/s So, length of train = 24 × x = 24x metres And, 24x + 234 = 1.5 × x × 42 Or, 39x = 234 Or, x = 6 m/s So, length of train = 24 × 6 = 144 metres Desired time = (144 + 126)/6 = 45 seconds

    Practice Next