Irene R. answered 01/29/20
BS in Mechanical Engineering and Certified math teacher for 13 years
The rate of 1500 books in 12 minutes is equivalent to 125 books in 1 minute (or the unit rate).
NOTE: To determine this rate, divide 1500 by 12 = 125
Then to find the number of books that can be done in 5 minutes , multiply the unit rate by 5:
125 books/ 1 minute * 5 = 625 books in 5 minutes