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NCERT Solutions Class 8 Mathematics Solutions for Exercise 13.2 in Chapter 13 - Direct and Inverse Proportions
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Q11) A school has 8 periods a day each of 45 minutes duration. How long would each period be? The school has 9 periods a day, assuming the number of school hours to be the same?
Answer:
Solution:
Let the duration of each period be x.
Here the number of periods and the duration of periods are in inverse proportion.
\therefore\frac{8}{9}=\frac{x}{45}\Rightarrow x=\frac{8\times45}{9}
\Rightarrow\ x=40 minutes.
The duration of each period would be 40 minutes.
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