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    Question

    Jiya, Kavya, Shivam, and Mani start walking from the

    same point in the same direction around a rectangular track and each one of them completes one round in 180 seconds, 270 seconds, 360 seconds, and 450 seconds respectively. After how much time will they all meet again at one point?
    A 1 hours 30 minutes Correct Answer Incorrect Answer
    B 3 hours 30 minutes Correct Answer Incorrect Answer
    C 1 hours 45minutes Correct Answer Incorrect Answer
    D 4 hours 20 minutes Correct Answer Incorrect Answer

    Solution

    Jiya Kavya, Shivam, And Mani=180,270,360,450second LCM of 180,270,360,450second=5400sec Meeting point =5400/60min =90min=1 hours 30 minutes

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