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?
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.
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