**Answer:**

**The rate of change for each reader is :**

**For J K Rowling : 17 and a half pages per hour**

**For R L Stone : 15 pages per hour**

**Step-by-step explanation:**

Here the reading rate of each reader is given as:

J.K. Reads 35 pages every 2 hours.

So, the number of pages read by J K in 2 hours = 35 pages

⇒ The number of pages read per hour = 35 / 2 = 17 . 5 pages

**So, the pages read by J K Rowling in 1 hour is 17 and a half pages.**

R L Stone reads 45 pages every 3 hours.

So, the number of pages read by R L in 3 hours = 45 pages

⇒ The number of pages read per hour = 45 / 3 = 15 pages

**So, the pages read by R L Stone in 1 hour is 15 pages.**

**Hence, the rate of change for each reader is :**

**For J K Rowling : 17 and a half pages per hour**

**For R L Stone : 15 pages per hour**