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An electronic device makes a beep after every 15 minutes. Another device makes a beep after every 20 minutes. They beeped together at 6 a.m. At what time will they next beep together?

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answer is A.

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Detailed Solution

Consider the time, 15 and 20.
LCM of 15 and 20 is 60 minutes, i.e., 1 hour.
Therefore, the electronic devices will beep together exactly after an hour so, they both will beep at 7 AM.
Therefore, option 1 is correct.

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