The traffic lights at three different road crossings change after every 3 minutes, 2 minutes and 4 minutes respectively. If they all change simultaneously at 8:00 p.m., when will they again change simultaneously?
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Answer:
8:12 p.m
Step-by-step explanation: The time when they will change simultaneously will be their LCM
LCM of 2, 3, and 4 is 12.
Therefore after 12 mintes past 8:00, they will change simultaneously. Hence the answer is 8:12 p.m
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