Problem:
Sam drove miles in minutes. His average speed during the first minutes was (miles per hour), and his average speed during the second minutes was . What was his average speed, in mph, during the last minutes?
Answer Choices:
A.
B.
C.
D.
E.
Solution:
Sam covered miles during the first minutes and miles during the second minutes, so he needed to cover miles during the last minutes. Thus his average speed during the last minutes was
The problems on this page are the property of the MAA's American Mathematics Competitions