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Hamilton rides 12 miles downhill, then back uphill at 8 mph slower, taking 2 hours longer. His downhill speed is:
A14 mph
B16 mph
C12 mph
D10 mph
Answer & Solution
Correct answer: C. 12 mph
1. Downhill at 12 mph takes 1 hour.
2. Uphill at 4 mph takes 3 hours.
3. The gap is 2 hours, so downhill is 12 mph.
_Source: OpenStax Elementary Algebra, Chapter 8, Solve Uniform Motion and Work Applications._
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