The bells begin tolling at the same time and continued to do so at intervals of 21, 28, 30 seconds respectively. The bells will toll together again after

The bells begin tolling at the same time and continued to do so at int

1.	The bells begin tolling at the same time and continued to do so at intervals of 21, 28, 30 seconds respectively. The bells will toll together again after
A.	7 seconds
B.	420 seconds
C.	630 seconds
D.	1764 seconds
Answer» C. 630 seconds

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The bells begin tolling at the same time and continued to do so at intervals of 21, 28, 30 seconds respectively. The bells will toll together again after

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