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Traffic light at three different road crossing changed after 48,72,108 seconds if they changsimultaneously at7 am what time they change simultaneously



First take out the LCM of 48,72 and 108 seconds.
That is 432 seconds
Now divide 432 by 60 in order to get a proper time.
The quotient will be the minutes and the remainder will be the seconds
So It will be 7 minutes and 12 seconds
Now add this to 7 am 
The time will be 7:7:12 am

I hope this helps......
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