Q13 of 54 Page 165

A school has 9 periods a day each of 40 minutes duration. How long would each period be, if the school has 8 periods a day, assuming the number of school hours to be the same?

Lesser the number of periods in a day, more the duration of them. So, it is an inverse proportion.


Let the required duration be x.


⇒ 9 × 40 = 8 × x


⇒ x = = 45 days


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