Final answer:
Leo's unit rate of reading is 13 pages per hour, which means he reads 13 pages in each hour of reading time.
Step-by-step explanation:
The unit rate for pages per hour when Leo reads 13 pages in an hour is A) 13 pages per hour. To find the unit rate, we divide the number of pages (13) by the number of hours (1). This gives us 13 pages per hour. The unit rate represents the amount of pages read in one hour. In this case, Leo reads 13 pages in one hour, so the unit rate is 13 pages per hour. The question asks about finding the unit rate of pages Leo reads per hour. When Leo reads 13 pages in one hour, his reading speed is 13 pages for each hour that passes. Therefore, the unit rate is simply the number of pages read divided by the number of hours. In this case, it is 13 pages divided by 1 hour, which equals 13 pages per hour. Hence, the correct answer is A) 13 pages per hour.