On April 24-28, 2017, the Senior Class of 2017 at PSJA Thomas Jefferson T-STEM ECHS presented their Capstone Projects culminating a year of in-depth research and investigation into a real-world issue. The topics were self-selected and represent each student's passion and career interests. The Capstone Project is a graduation requirement that prepares students for post-secondary education and career success.
A runner can run one mile in 7 minutes, but then for each mile after that her pace slows by 30 seconds per mile (i.e. she runs the second mile in 7:30, the third in 8 minutes etc).
After how many miles will her overall average pace be 9 minutes per mile?