Chapter 6 - Systems of Equations and Inequalities - 6-2 Solving Systems Using Substitution - Apply What You've Learned - Page 377: d

Interpreting the solution in terms of how we defined $x$ and $y$ in part (a), Ashley spends $\displaystyle \frac{80}{3}=26\frac{2}{3}$ minutes on the stair machine, and $\displaystyle \frac{40}{3}=13\frac{1}{3}$ minutes on the rowing machine (This is a total of 40 minutes of exercise.)

Given above.