ISEE Mathematics Achievement Question 317: Answer and Explanation

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Question: 317

1. Ted can read 60 pages per hour. Naomi can read 45 pages per hour. If both Ted and Naomi read at the same time, how many minutes will it take them to read a total of 210 pages?

  • A. 72
  • B. 120
  • C. 145
  • D. 180

Correct Answer: B

Explanation:

B The question is asking for a specific value and there are real numbers in the choices, so use PITA to solve. Ted can read 60 pages per hour, which is 60 pages in 60 minutes, and Naomi can read 45 pages in 60 minutes. Combined, they can read 105 pages (60 + 45) in 60 minutes. Now, start with one of the middle choices to see which answer will yield a total of 210 pages. Try (B) since if they read for 120 minutes, they will read double the amount they did in 60 minutes. That will make the math easy. In 60 minutes they read 105 pages, so 105 × 2 = 210. This satisfies the question, so (B) is correct.

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