In 3 hours, Liza reads 20 x 3 = <<20*3=60>>60 pages.

In 3 hours, Suzie reads 15 x 3 = <<15*3=45>>45 pages.

Liza reads 60 - 45 = <<60-45=15>>15 pages more than Suzie.

# Answer

15
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Liza reads 20 pages in an hour, and Suzie reads 15 pages in an hour. How many more pages does Liza read than Suzie in 3 hours?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
15
Liza reads 20 pages in an hour, and Suzie reads 15 pages in an hour. How many more pages does Liza read than Suzie in 3 hours?
train