Quantitative Aptitude Number System LCM and HCF

Two alarm clocks ring their alarms at regular intervals of 144 seconds and 120 seconds. If they first beep together at 6:00 pm, at what time will they beep together again for the next time?

1

6:18 PM

2

6:15 PM

3

6:21 PM

4

6:12 PM

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