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?
Solution:
Let’s find the L.C.M of 48, 72 and 108.
Therefore, L.C.M of 48, 72 and 108
It means that lights will change simultaneously again after 432 seconds.
432 seconds
7 minutes 12 seconds
Time at which lights will change simultaneously = 7:07 and 12 seconds
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