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A blue light every 30seconds. A red light blinks every 40seconds. If both lights blink at exactly 1:00pm, at what time will they blink at the same time again?

  • math -

    The least common multiple of 30 and 40 is 120.

    30, 60, 90, 120

    30, 80, 120

    1:00 + 120 seconds = ?

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