Answer:
Let each period be x minutes long. We have the following table
We note that more the number of periods, lesser would be the length of each period. Therefore, this is case of inverse proportion. So, \[8\times 45=9\times x\] \[\Rightarrow \] \[x=\frac{8\times 45}{9}\] \[\Rightarrow \] \[x=40\] Hence, each period would be 40 minutes long. Number of periods 8 9 Length of each period (in minutes) 45 \[x\]
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