Question: Grace can read a 200-page book in 20 hours. How long would it take her to finish reading a 250-page book at this constant rate? Is final answer 25?
Answer: Grace can read 200/20 = <<200/20=10>>10 pages in 1 hour.
So she can finish a 250-page book in 250/10 = <<250/10=25>>25 hours.
#### 25