Question

    In a circular race of 750 m, X and Y start from the same

    point and at the same time with speeds of 9 km/h and 13.5 km/h, respectively. If they are running in the same direction then, when will they meet again for the first time on the track?
    A 750 seconds Correct Answer Incorrect Answer
    B 900 seconds Correct Answer Incorrect Answer
    C 500 seconds Correct Answer Incorrect Answer
    D 600 seconds Correct Answer Incorrect Answer

    Solution

    Track length = 750 m
    Speeds: X = 9 km/h = 2.5 m/s, Y = 13.5 km/h = 3.75 m/s
    Relative speed (same direction) = 3.75 − 2.5 = 1.25 m/s
    Time to meet = 750 ÷ 1.25 = 600 seconds = 10 minutes

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