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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Answered by
1
L.C.M of 48,72,108 => 432.
Second= 7 min 12 sec
Require time=> 8:7:12 (on 24 hour clock)
Second= 7 min 12 sec
Require time=> 8:7:12 (on 24 hour clock)
Answered by
1
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.
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