1. The problem asks for the total time Jack exercised before swimming. 2. We add the time biking and jogging: $$\frac{3}{4} + \frac{5}{6}$$ 3. Find a common denominator for $$\frac{3}{4}$$ and $$\frac{5}{6}$$, which is 12. 4. Convert fractions: $$\frac{3}{4} = \frac{9}{12}$$ and $$\frac{5}{6} = \frac{10}{12}$$ 5. Add: $$\frac{9}{12} + \frac{10}{12} = \frac{19}{12}$$ hours. 6. Convert $$\frac{19}{12}$$ to a mixed number: $$1 \frac{7}{12}$$ hours. 7. Final answer: Jack exercised $$1 \frac{7}{12}$$ hours before swimming.