Digital PSAT Math Practice Question 284: Answer and Explanation

Question: 284

A speed-reading course teaches students to read 1,000 words per minute. If a graduate from this course were able to read this quickly, how many minutes would it take her to read a book that has 200 pages with an average of 300 words per page?

• A. 30
• B. 60
• C. 90
• D. 150

Correct Answer: B

Explanation:

(B) First, figure out how many words she would have to read. In other words, how many words are in the book?

Next, figure out how long it would take her to read 60,000 words by setting up a dimensional analysis such that you cancel out the units that you don't want (words) and end up with the units that you do want (minutes). Since she can read 1,000 words per minute, you have

Therefore, it will take her 60 minutes, choice (B).