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11 October, 16:37

A red light flashes every 14 minutes. A blue light flashes every 24 minutes. When will the two lights flash together again, if they last flashed together at 8 AM?

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  1. 11 October, 20:12
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    The least common multiple of 14 and 24 is 168.

    The lights flash together every 168 minutes.

    168 minutes = 2 hours 48 minutes.

    If they flashed together at 8 AM, then they'll flash

    together again at 10:48 AM.
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