3 bells ring at the time interval of 35, 45 and 105 seconds. If they rang together at 6:20:15 A.M, then find out the time when they together ring again? 

1
6:21:30 A.M
2
6:22:15 A.M
3
6:25:30 A.M
4
6:25:15 A.M

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