leo reads 11
hour. What is the unit rate for pages per hour? For hours per page?
So Leo reads 11 pages in half an hour, which is 30 min.
There are 60 min in one hour, so he would read double the pages.
11 * 2 = 22, so Leo reads 22 pages per hour. That is his unit rate :D
Hours per page? Well, just divide by 22 to get 1 page per 1/22 hours, which basically means 1/22 hours per page. :D