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in a school the duration of a period in junior section is 40 minutes and senior section is 1 hour .if the first bell for each section rings at 9.00 am when will the bells ring together again?
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?in a school the duration of a period in junior section is 40 minutes ...
Calculation of Ringing Bells for Junior and Senior Sections


Given Data:


  • Duration of a period in Junior Section: 40 minutes

  • Duration of a period in Senior Section: 1 hour (60 minutes)

  • First bell rings for each section at 9:00 am



Approach:

To find out when the bells will ring together again, we need to calculate the time taken by each section to complete one period. Then, we will find out the least common multiple of the two times to get the time after which the bells will ring together again.


Duration of One Period:


  • Junior Section: 40 minutes

  • Senior Section: 60 minutes



Least Common Multiple (LCM):

The LCM of 40 and 60 is 120. This means that the bells will ring together again after 120 minutes.


Time of Next Bell Ringing:

The first bell for each section rings at 9:00 am. To calculate the time of next bell ringing, we need to add the duration of one period to the current time.



  • Junior Section: 9:40 am

  • Senior Section: 10:00 am



Conclusion:

The bells will ring together again after 120 minutes, i.e., at 10:00 am.
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?in a school the duration of a period in junior section is 40 minutes ...
The next building at 9:40
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