Problem:
When Cheenu was a boy he could run miles in hours and minutes. As an old man he can now walk miles in hours. How many minutes longer does it take for him to walk a mile now compared to when he was a boy?
Answer Choices:
A.
B.
C.
D.
E.
Solution:
As a boy it took Cheenu hours and minutes, which is minutes, to go miles. That is a rate of minutes per mile. As an old man it takes him hours, or minutes, to travel miles. That is a rate of minutes per mile. It takes him minutes more to walk a mile as an old man.
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions