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:

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._