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In a school the duration of a period in junior section is 40 minutes and in the senior section is 60 minutes. If the first bell for each section rings at 9 a.m. when will the two bells ring together again.

Posted by Anjali Sanodiya 4 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Karthik Moyye 4 years, 3 months ago

For any action to be repeated,find the LCM of 40 and 60 ie 120,then convert 120 into hours. 120/60(1 hour=60 minutes) so it is again in two hours. Now add 2 hours to 9am and you will get 11:00am

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