2007 AMC 12A Problem 4
Attempt Problem 4 of the 2007 AMC 12A below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2007 AMC 12A solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
4.
Kate rode her bicycle for minutes at a speed of mph, then walked for minutes at a speed of mph. What was her overall average speed in miles per hour?
Answer: A
Small hint:
Average speed is total distance divided by total time, not the average of the two speeds
Big hint:
She rides miles and walks miles over a total of hours
Solution:
Kate rode for hour at mph, covering miles.
She walked for hours at mph, covering miles.
She covered miles in hours, so her average speed was mph.
Thus, the correct answer is A.
Problem 4 in other years
- 1950 AMC 12
- 1951 AMC 12
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