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An express train takes 4 hours and a local train 5 hours for the same trip, the express being 12 mph faster. The local train's speed is:
A50 mph
B48 mph
C60 mph
D36 mph
Answer & Solution
Correct answer: B. 48 mph
1. Both cover the same distance.
2. 5r equals 4 times r plus 12.
3. So r is 48 mph.
_Source: OpenStax Elementary Algebra 2e, Chapter 3, Uniform Motion Applications (CC BY 4.0)._
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