ISEE Mathematics Achievement Question 294: Answer and Explanation

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Question: 294

6. Merry drove 350 miles from New Orleans to Houston in 7 hours. She then drove 240 miles from Houston to Dallas in 4 hours. What was her approximate average rate of speed, in miles per hour (mph), for the entire trip?

  • A. 50.0 mph
  • B. 53.6 mph
  • C. 55.0 mph
  • D. 60.0 mph

Correct Answer: B

Explanation:

B When you see the word average, draw an Average Pie . To find the average for the whole trip, find the total number of miles: 240 mi + 350 mi = 590 mi. Put 590 in the total part of the Average Pie. Then find the total number of hours Merry drove: 4 hrs + 7 hrs = 11 hrs. 11 will go in the # of items spot. Next, divide to find the average: . To save yourself some time, remember to ballpark! Notice that the result will not be a whole number, so the correct answer must be (B).

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