We have been given that J.K. Rowling reads 35 pages every 2 hours and R.L. Stein reads 45 pages every 3 hours. We are asked to find the rate of change for each reader.

Let us divide 35 by 2 to find rate of change for J.K. Rowling.

Therefore, rate of change of J.K. Rowling is 17.5 pages per hour.
Let us find rate of change for R.L. Stein.

Upon dividing 45 by 3 we will get,

Therefore, rate of change of R.L. Stein is 15 pages per hour.