At a railway station

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 At a railway station there are two platforms. At one platform, trains leave every 24 minutes and at the other every 30 minutes. If trains leave both platforms at 9 a.m., what time is it when trains next leave both platforms at the same time?

Comments

  1. Anonymous27 September 2021 at 18:45

    For this question, you need to find the lcm of 24 and 30. To do this we can use prime factorization.

    24 = 2³ ⨉ 3
    30 = 2 ⨉ 3 ⨉ 5

    Now we take each power and find the highest power out of the other powers.
    This would give 2³ ⨉ 3 ⨉ 5 which is 120. 120 is our answer

    ReplyDelete

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