Final answer:
Oliver read at a rate of 23.25 pages per hour.
Step-by-step explanation:
To find the rate at which Oliver read, we need to divide the number of pages by the number of hours. 31 pages / 1 1/3 hours. First, let's convert 1 1/3 hours to an improper fraction. 1 1/3 is equal to 4/3. Now we can divide the number of pages (31) by the number of hours (4/3) to find the rate. When we divide a number by a fraction, we can multiply by its reciprocal. 31 pages * 3/4 hours = 23.25 pages per hour. So Oliver read at a rate of 23.25 pages per hour.