1. **State the problem:** We need to find the average speed of an airplane that flies 700 meters in 3 \frac{1}{3} seconds. 2. **Formula:** Average speed is given by the formula: $$\text{Average speed} = \frac{\text{Total distance}}{\text{Total time}}$$ 3. **Convert mixed number to improper fraction:** $$3 \frac{1}{3} = \frac{10}{3} \text{ seconds}$$ 4. **Apply the formula:** $$\text{Average speed} = \frac{700}{\frac{10}{3}}$$ 5. **Simplify the division by a fraction:** $$\frac{700}{\frac{10}{3}} = 700 \times \frac{3}{10}$$ 6. **Multiply and simplify:** $$700 \times \frac{3}{10} = \frac{700 \times 3}{10} = \frac{2100}{10}$$ 7. **Simplify the fraction:** $$\frac{2100}{10} = 210$$ 8. **Final answer:** The average speed of the airplane is **210 meters per second**.