Lesson: Intermediate Problem Solving - 22t01

Practice: Unlikely Answer Choices, continued

[Page 22 of 27]
And one more. Use your knowledge of unlikely or trap answers to identify the culprit choices in the following question, then select the correct answer and then click Continue.

It took John 3 hours to ride 45 miles. If he took another 2 hours to ride another 10 miles, what was his average speed over the entire trip?
8
10
10.5
11
12

Using the average formula, we find:

. Choice (D) is correct.

Choice (B), 10, is wrong, and a trap answer, because it is the average of the two individual rates: .

Choice (C), 10.5, is an oddball answer choice, since it's the only noninteger.

If you were guessing you could eliminate Choices (B) and (C) for your best guess.

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