SOLUTION: the traffic light at three different road crossings change after every 48,72 and 108 sec,.if they all change simultaneously at 8:20:00 hrs, then at what time will they again change

Question 895830: the traffic light at three different road crossings change after every 48,72 and 108 sec,.if they all change simultaneously at 8:20:00 hrs, then at what time will they again change simultaneously?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Find the LCM of 48, 72, and 108.

So then,

So count 432 seconds from 8:20.
432 seconds equals 7 minutes 12 seconds.
8:20:00 + 0:07:12=8:27:12
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