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Three alarm clocks ring at an interval of 4,12 and 20 minutes resp. All three alarm clocks rang at 5am , when these three alarm clocks will be ring together next.

Posted by San.. .. 3 years, 11 months ago

CBSE > Class 10 > Mathematics

4 answers

Priya . 3 years, 11 months ago

To find the time when the clocks will next ring together, we have to find LCM of 4, 12 and 20 minutes. ⇒ LCM of 4, 12 and 20 = 22 × 3 × 5 = 60 minutes. So, the clocks will ring together again after 60 minutes or one hour.

0Thank You

Anita Sharma 3 years, 11 months ago

6:00 am

1Thank You

Rithika Subramanian 3 years, 11 months ago

Take common LCM FOR 4,12,20 and then the LCM is 60 Then the answer is 5:60

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Jashmitha Alekhya 3 years, 11 months ago

10 am

1Thank You

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CBSE > Class 10 > Mathematics