Final answer:
Understanding the rate of printing books can help determine the time difference for printing multiple books.
Explanation:
To calculate how much less time it will take to print 5 books of 504 pages, consider the concept of rate. If the time taken per book is known, you can find the total time for 5 books and compare it to the time for 1 book. Let's assume each book takes x hours to print. The total time to print 5 books is 5x, while the time to print 1 book is x. The difference is 4x hours, which is the answer to the question.
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