2018 AMC 12B Problem 2
Attempt Problem 2 of the 2018 AMC 12B 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 2018 AMC 12B solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
2.
Sam drove miles in minutes. His average speed during the first minutes was mph (miles per hour), and his average speed during the second minutes was mph. What was his average speed, in mph, during the last minutes?
Answer: D
Small hint:
Find the distance covered in each of the first two -minute segments
Big hint:
The remaining distance is covered in hour; divide to get the speed
Solution:
In the first minutes Sam covered miles, and in the second he covered miles.
The last minutes covered miles, so the speed was
Thus, the correct answer is D.
Problem 2 in other years
- 1950 AMC 12
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