The traffic signals at 3 different road crossing chages after evry 48 s,72s,and 108s respectively.If they all change simultaneously at 8 hours, then what time will they again change simultaneously?

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Solution

Changing of traffic light at three different road=1st road=48 seconds
2nd road=72 seconds
3rd road=108 seconds
LCM of 48, 72 & 108=2232233
=432 seconds
432=432/60 minutes
=7 minutes 12 seconds.
They will change simultaneously at 7:00 a.m + 7 minutes 12 seconds= 07:07:12 A.M.

They will change simultaneously at 07:07:12 A.M.

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