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Question

Two alarm clocks ring their alarms at regular intervals of 60 seconds and 90 seconds. If they first beep together at 12 noon, at what time will they beep again together for the first time?


  1. 12:02 PM

  2. 12:03 PM

  3. 12:04 PM

  4. 12:05 PM

  5. 12:01 PM


Solution

The correct option is B

12:03 PM


For calculating the time at which they beep again together for the first time, we will simply calculate the LCM of 60 and 90.

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