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Christopher drove 1.5 hours and his parents 1 hour to meet, with him 10 mph faster. His parents' speed was:
A45 mph
B40 mph
C50 mph
D30 mph
Answer & Solution
Correct answer: B. 40 mph
1. 1.5 times r plus 10, plus r, equals 115.
2. 2.5r plus 15 is 115.
3. So r is 40 mph.
_Source: OpenStax Elementary Algebra 2e, Chapter 3, Uniform Motion Applications (CC BY 4.0)._
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