Editor A-
Rate of reviewing= 12 pages/ hr.
Time taken by him by 1:30 pm = 4.5 hr (since started at 9 am)
Total no. of pages reviewed by 1:30pm= 12x 4.5= 54 pages
Editor B-
Rate of reviewing= 16 pages/ hr.
Time taken by him by 1:30 pm = 3.5 hr (since started at 10am)
Total no. of pages reviewed by 1:30pm= 16x3.5=56
Editor C-
Rate of reviewing= 18 pages/ hr.
Time taken by him by 1:30 pm = 2.5 hr (since started at 11 am)
Total no. of pages reviewed by 1:30pm= 18x2.5= 45
Editor D-
Rate of reviewing= 10 pages/ hr.
Time taken by him by 1:30 pm = 1.5 hr (since started at 12 pm)
Total no. of pages reviewed by 1:30pm=
10x1.5= 15
Editor E-
Rate of reviewing= 20 pages/ hr.
Time taken by him by 1:30 pm = 0 hr (since started at 1:30 pm)
Total no. of pages reviewed by 1:30pm= 0x20= 0 pages
therefor, x= 54+56+45+15= 170.
Now, for 6:00pm
Editor A-
Rate of reviewing= 12 pages/ hr.
Time taken by him by 6 pm = 9 hr
Total no. of pages reviewed by 6pm= 12x 9= 108 pages
Editor B-
Rate of reviewing= 16 pages/ hr.
Time taken by him by 6 pm = 8 hr
Total no. of pages reviewed by 6pm= 16x8=128
Editor C-
Rate of reviewing= 18 pages/ hr.
Time taken by him by 6 pm = 7 hr
Total no. of pages reviewed by 6pm= 18x7= 126
Editor D-
Rate of reviewing= 10 pages/ hr.
Time taken by him by 6 pm = 6hr
Total no. of pages reviewed by 6pm=
10x6= 60
Editor E-
Rate of reviewing= 20 pages/ hr.
Time taken by him by 6 pm = 4.5hr
Total no. of pages reviewed by 6pm= 4.5x20= 90 pages
therefor, y= 108+128+126+60+90= 512 pages.
Ans- x=170, y=512