Quantitative Aptitude Number System LCM and HCF

Two alarm clocks ring their alarms at regular intervals of 72 seconds and 80 seconds. If they first beep together at 6:00 am, at what time will they beep again for the first time?

1
6:19 AM
2
6:17 AM
3
6:15 AM
4
6:12 AM

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