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Judy pilots her powerboat 5 miles into a 7 mph wind in the time she covers 12 miles with a 7 mph tailwind. Her boat's own speed is:
A21 mph
B17 mph
C15 mph
D19 mph
Answer & Solution
Correct answer: B. 17 mph
1. Set 5 over (v minus 7) equal to 12 over (v plus 7).
2. Cross multiply to get 7v equal to 119.
3. Her speed is 17 mph.
_Source: OpenStax Elementary Algebra, Chapter 8, Solve Uniform Motion and Work Applications._
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