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this is finding LCM type question
the traffic light will change simultaneously at such interval as is divisible by individual time duration of changing light. the minimum of such interval will be LCM of 48, 72 and 108 seconds
48 = 2*2*2*2*3
72 = 2*2*2*3*3*
108 = 2*2*3*3*3
LCM = 2*2*2*2*3*3*3 = 432 second
= 7 minute 12 seconds
This, after 7 am, the lights will change simultaneously on 7:07:12 am
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