New RBI Grade B 2025 Notification will come Soon! Enroll Here

    Question

    Three bells ring at intervals of 28 seconds, 60 seconds,

    and 84 seconds, respectively. How many times will all three bells ring together in a span of 10 minutes?
    A 1 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 2 Correct Answer Incorrect Answer

    Solution

    Time taken by all 3 bells to ring together = L.C.M of 28, 60 and 84 = 420 seconds 10 minutes = 10 X 60 = 600 seconds 600 ÷ 420 ~ 1.42 So, the three bells will ring together only once in the given interval of 10 minutes.

    Practice Next