An athlete travels at $8\,\text{m s}^{-1}$ for $10\,\text{s}$, then continues at $6\,\text{m s}^{-1}$ for $12\,\text{s}$. Which calculation determines the athlete’s average speed in $\text{m s}^{-1}$?
- A$\frac{8+6}{2}$
- B$\frac{(8\times10)+(6\times12)}{22}$
- C$\frac{(8\div10)+(6\div12)}{22}$
- D$\frac{(10\div8)+(12\div6)}{22}$