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?
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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.