NEET Foundation 2022
NEET Foundation 2022.
6. The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they change simultaneously at 7 a.m., at what time will they change simultaneously again?
NEET Foundation 2022.
Biology Foundation for Class 10.
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The time period after which these lights will change = LCM of 48, 72 and 108
LCM=2
2
2
2
3
3
3 = 432
They will change together after every 432 seconds i.e., 7 min 12 seconds.
Hence, they will change simultaneously at 7:07:12 am.