Answer:
Step-by-step explanation:
Raina takes 30 minutes for 39 pages. So that means she read 1.3 pages per minute. Then we take 312 divided by 1.3 = 240 minutes, she needs to finish the book.
Robert takes 50 minutes for 60 pages. So that means he read 1.2 pages per minute. Then we take 312 divided by 1.2 = 260 minutes.
260mins - 240mins = 20 mins
So Robert will need 20 minutes to finish the book.
