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In a school the duration of a period in primary is 40 minutes , middle section is 50 minutes and higher section is 60 minutes . If the first bell rings at 7:30 am when will the 3 bells ring together again ?​

 Mar 18, 2020
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The LCM  of  40    50    and   60      is  600 minutes   which is    10 hours from 7:30.......

 Mar 18, 2020

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