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Three electronic devices make a beep after every 48 sec, 72 sec and 108 sec respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is

10:07:12 hrs
10:07:24 hrs
10:07:36 hrs
10:07:48 hrs

Correct Answer: 10:07:12 hrs

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