Quantitative Aptitude Number System LCM and HCF

Three bells ring simultaneously at 7 p.m. They ring at regular intervals of 15 minutes, 18 minutes and 20 minutes respectively. The time when all the three bells will ring together is:

1

9 p.m.

2

10 p.m.

3

9.30 p.m.

4

10:30 p.m

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