I actually got this question on an exam before, so first, you would need to find the unit rate, (how many pages the printer can print in 1 minute) which is 1,200 divided by 30, in which you get 40. So, the printer prints 40 pages in 1 minute. Divide 520 pages by 40 pages to get 13. 13 is how many minutes it takes to print 520 pages.
