Concept explainers
Speedy (S). You enter a tollway and are given a toll card at 12:00 noon. The speed limit is 65 m.p.h. You travel 140 miles on the tollway and then exit at 2:00 P.M. You give the card to the attendant, who looks at it and immediately calls the police. Why did she call the police? How can she prove you broke a law?
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The Heart of Mathematics: An Invitation to Effective Thinking
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