1.

1). 40 minutes2). 50 minutes3). 42 minutes4). 45 minutes

Answer»

It is understood that SCHOOL can be open for only FIXED number of hours

No. of school hours = 6 × 60 = 360 minutes

Let duration of each period in new schedule be X minutes

⇒ 360 = 9 × X

⇒ X = 360/9

∴ X = 40 minutes



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