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All three begin to ring at 9 a.m. At what time will they again toll together?

A
11.30 a.m
B
11.45 a.m
C
12.00 noon
D
11.20 a.m
Correct Option: C

Explanation

The Math: LCM(9, 12, 15) = 180 minutes = 3 hours. Therefore, the bells ring together again at 12:00 noon.

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