if the school has 9 periods a day

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11. A school has 8 periods a day each of 45 minutes duration. How long would each period be, if the school has 9 periods a day, assuming the number of school hours to be the same?
12
Oct
11. A school has 8 periods a day each of 45 minutes duration. How long would each period be, if the school has 9 periods a day, assuming the number of school hours to be the same? 11. A school has 8 periods a day each of 45 minutes duration. How long would each period [...]
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