Question

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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Answer 1

L.C.M of 48,72,108 => 432.
Second= 7 min 12 sec
Require time=> 8:7:12 (on 24 hour clock)

Answer 2

It will take the first light, 9 changes, the second one 6 and third one 4 to change simultaneously again.   At that time, it will be 7:07 12 seconds AM or 432 seconds later.