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A light flashes every 15 minutes. a second light flashes every 18 minutes. both lights flash together are 2 a.m. What will the time be when they net flash together?

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2 answers
  1. 1st light:
    15 30 45 90 ...
    2nd light:
    18 36 54 72 90....
    ahhh!!

    So what is 90 minutes from 2:00 am ?

    another way to look at it ...
    What is the LCM for 15 and 18 ?

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  2. 90

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