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  • Real Numbers - LCM and HCF
  • Two alarm clocks beep at regular intervals of 50 seconds ...
Multiple choice

Two alarm clocks beep at regular intervals of 50 seconds and 48 seconds. If they first beep together at 12.00 pm noon, at what time will they beep again?

  1. 12:20 pm

  2. 12:12 pm

  3. 12:11 pm

  4. 12:15 pm

  5. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

LCM of 50 and 48 is 1200 seconds. 1200 seconds = 20 minutes So, they will beep again at 12:20 p.m.

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