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One class period at Lily's school lasts for an hour and fifteen minutes, or $\frac{5}{4}$ hours. However, her Biology class usually spends the first five minutes of that time talking and the next ten minutes reviewing old homework problems before they begin the lesson, which goes until the end of class. What fraction of Lily's time is spent on the lesson itself?

 Mar 24, 2020
 #1
avatar+111330 
+1

5 min  =   1/12   hour

 

10  min  =  1/6   hour

 

So.....actual lesson time =

 

5/4  - 1/12   -1/6  =

 

15/12  - 1/12  - 2/12  =

 

12 / 12   =    

 

1  hour of lesson time

 

So

 

Lesson time  /Total Time   =

 

1 / (5/4)   =

 

4/5   of the time spent on the lesson itself    

 

 

cool cool cool

 Mar 24, 2020
 #2
avatar+1970 
+2

Nice,Chris!!!!

CalTheGreat  Mar 24, 2020

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