Answer :
The second example is a greater rate of reading.
In order to come to that conclusion, I didn't do any figuring, ciphering,
numerating, or calculating of any kind. I just sat there and looked at
the question. I noticed that the second example is more pages than
the first one, but done in less time than the first one. So I know that
it must be a greater rate of cranking out the pages.
The first rate is 18/36 = 0.5
While the second rate is 20/30 = 0.6666666
So the second rate is greater.