I did 70 times 60 which gave me 4,200 then with the 10 and 20 I subtracted it to 70 and did 20 times 40 that gave me 800 then subtracted that by 4200 then it gave me 3,400.
The total pages she wants to finish (360) minus the pages she has read (112.5) equals to 247.5 Then divide it by the 45 (the rate of pages she reads per hour) 5.5 hours.