Explanation:

Four bells ring at intervals 4, 6, 8 and 14 seconds.  

They ring simultaneously at 12:00 O' clock.

To find:

When will the bells ring together = LCM(4,6,8,14)= 168

Four bells ring  will ring simultaneously  after  168/60 =2 min 48 sec. means at 12 hrs 2 min 48 sec.