Three bulbs red, green and yellow flash at intervals of 80 seconds, 90 seconds and 110 seconds. All three flash together at 8:00 am. At what time will the three bulbs flash altogether again? *
1 point
9 : 00 am
9 : 12 am
10 : 00 am
10 : 12 am
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I think the answer is 9 12
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