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Tony drives 4 hours in all, 208 miles on the interstate and 40 on country roads, going 15 mph faster on the interstate. His country road speed is:
A50 mph
B40 mph
C60 mph
D45 mph
Answer & Solution
Correct answer: A. 50 mph
1. At 50 mph the 40 miles take 0.8 hours.
2. At 65 mph the 208 miles take 3.2 hours.
3. Those add to 4 hours, so 50 mph is right.
_Source: OpenStax Elementary Algebra, Chapter 8, Solve Uniform Motion and Work Applications._
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