An athlete travels at a speed of $8\,\text{m s}^{-1}$ for $10\,\text{s}$, then moves at $6\,\text{m s}^{-1}$ for $12\,\text{s}$. Which calculation would find the athlete’s average speed in $\text{m s}^{-1}$?
- A$\frac{8 + 6}{2}$
- B$\frac{(8 \times 10) + (6 \times 12)}{22}$
- C$\frac{(8 \div 10) + (6 \div 12)}{22}$
- D$\frac{(10 \div 8) + (12 \div 6)}{22}$