there are 3 alarms A, B , C.A rings after every 3 hrs, B rings after every 4 hrs and C rings after every 6 hrs.Find the time interval after which the 3 alarms ring together after ringing once.

Asked by Amyra B | 17th Apr, 2013, 06:44: PM

Expert Answer:

We need to find the time at which all the 3 alarms will ring at the same time, hence we need to find the lowest common multiple of the time intervals of the 3 alarams i.e. LCM (3,4,12) = 12
Hence, the three alarms will ring together at every 12 hour intervals. 

Answered by  | 17th Apr, 2013, 09:03: PM

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