A red light flashes every 14 minutes. A blue light flashes every 24 minutes. When will the two light flash together again, if they last flashed together at 8:00 am?

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asked Nov 5, 2016 60.9k views

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Pat Gilmour · Answer 1 · 2016-11-11T10:47:27+0000

The LCM of 14 and 24 is 168. So 168 minutes after 8 a.m. the lights will flash again. 168 minutes is 2 hours and 48 minutes. Add that to 8 a.m. and you get 10:48 a.m. which is your answer.

A red light flashes every 14 minutes. A blue light flashes every 24 minutes. When will the two light flash together again, if they last flashed together at 8:00 am?

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