There are three bells which ring at regular intervals of 30, 45 and 60 seconds respectively. If all of them ring together at 1:00 PM, at what time will they ring together again?

There are three bells which ring at regular intervals of 30, 45 and 60

1.	There are three bells which ring at regular intervals of 30, 45 and 60 seconds respectively. If all of them ring together at 1:00 PM, at what time will they ring together again?
A.	1:03 PM
B.	1:24 PM
C.	1:30 PM
D.	1:12 PM
Answer» B. 1:24 PM