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The traffic lights at three different road crossings change after every 48 seconds, 72 seconds, and 108 seconds resp. If they change simultaneously at 8

a.m. at what time will they change together again.


L.C.M of 48,72,108 can be taken to find the intervals of change =432 sec

After 432 sec  = 432÷(60×60)      =432÷3600        =0.12 hrs

Hence, next simultaneous change will take place at = 8.00 am +0.12  =8.12 am
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That is wrong stuff. Check the answer below
L.C.M of 48 , 72 and 108=432 sec=7 min 12 sec
Req.time=8:7:12(on a 24 hour clock)

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yaa...okok...ryt ryt..!!.........i ws doing wrong..!!.........thanks again...:) :)
Hehe...Don't make me laugh! in my class i am the best in maths and gained the nickname of "acharya" (given by my friends)
that's gud..!!...(Y)
u can call me the same
ok acharya...!!!.....:P :P :P
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