Chapter 8.1, Problem 88PE

Shelia swam $1\text{mi}$ and ran $6\text{mi}$ in a total of $\text{1 hr 15 min }\left(\frac{5}{4}\text{hr}\right).$ In another training session she swam $2\text{ mi}$ and ran $8\text{ mi}$ in a total of $2\text{ hr}$ . Determine the speed at which she swims and the speed at which she runs. Assume that her swimming speed was the same each day and that her running speed was the same each day.