The alarms of two alarm clocks sound at regular intervals of 72 seconds and 80 seconds. If they beep together for the first time at 6:00 am, at what time will they beep again for the first time?
ATQ- time of repeated beeps = 6:00+ LCM (72, 80) seconds = 6:00+720 seconds = 6:00 + 12 minutes = 6: 12 minutes AM
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