There are four bells in a temple, each of them rings at an interval of 3, 9, 12, 15 minutes respectively. If they ring together at 11 a.m., then at what time will they ring together again? 

1
2:00 a.m.
2
3:00a.m.
3
2:00 p.m.
4
3:00 p.m.

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