The traffic lights at three different road crossings change after every 48 sec., 72 sec and 108 sec.respectively .If they all change simultaneously at 8:20:00 hours,then at what time they again change simultaneously . Choose the correct answer:	A) 8:29:12 hrs	B) 8:22:12 hrs	C) 8:25:12 hrs	D) 8:27:12 hrs	E) 8:21:12 hrs
Interval of change = (L.C.M of 48,72,108)sec.=432sec.   So, the lights will agin change simultaneously after every 432 seconds i.e,7 min.12sec   Hence , next simultaneous change will take place at 8:27:12 hrs   Answer is 8:27:12 hrs.
<result>D</result>
The traffic lights at three different road crossings change after every 48 sec., 72 sec and 108 sec.respectively .If they all change simultaneously at 8:20:00 hours,then at what time they again change simultaneously .