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4 bells ring at intervals of 30 minutes,...

4 bells ring at intervals of 30 minutes, 1 hour, 1 hour 30 minutes and 1 hour 45 minutes respectively. All the bells ring simultaneously at 12 noon. They will again ring simultaneously at:

A

9 a.m.

B

3 a.m.

C

6 a.m.

D

12 a.m.

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The correct Answer is:
A
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