Ireally need . make sure you are explaining.

A HALF OF 300 is 150! So if there is 150 pages left you divide 150 with 60 and should get 2 with a remainder of 30 so it is now 9:30 P.M

9:30 would be your answer
 
because sense it was 7:00 1 hour = 60 minutes,
 
so add 60 minutes to 7:00 and it would turn to 8:00,
 
then do another 60 minutes which makes 8:00, 9:00.
 
And as you may know 60 x 2 is 120 so it said in the book that she read haft of the book right?
 
150 + 150 = 300 pages so sense 60 x 2 is 120 we minus 150 and 120 which is 30
 
so then we add 30 to 9:00, and makes 9:30

Hope this helped!