SOLUTION: Lessons in a certain class starts at 7.45 a.m and end at 3.45 p.m.,with an hour's break at lunchtime and 20 minutes morning rec

Question 98875: Lessons in a certain class starts at 7.45 a.m and end at 3.45 p.m.,with an hour's break at lunchtime and 20 minutes morning recess. If there are altogether 8 lessons of equal length , how long is each lesson ?
Answer by Adam(64) (Show Source): You can put this solution on YOUR website!
Lesson starts at 7:45 and ends at 15:45 - it takes 8 hours altogether, but we have to subtract lunch break - we get 7 hours and morning recess - 20 minutes, so we get 6 hours and 40 minutes - 6 hours that is 6*60 minutes, so we have 6*60+40 minutes = 360+40 = 400 minutes. If 8 lessons take 400 minutes, then 1 lesson takes 8* less (400/8), which is

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