Problem:
Sofia ran laps around the -meter track at her school. For each lap, she ran the first meters at an average speed of meters per second and the remaining meters at an average speed of meters per second. How much time did Sofia take running the laps?
Answer Choices:
A. minutes and seconds
B. minutes and seconds
C. minutes and seconds
D. minutes and seconds
E. minutes and seconds
Solution:
Each lap took Sofia seconds, so laps took her seconds, which is .
The problems on this page are the property of the MAA's American Mathematics Competitions