A long-distance runner wants to work out her average speed for a race. Which calculation should she use?
- A$\text{average speed} = \dfrac{\text{total distance}}{\text{total time}}$
- B$\text{average speed} = \text{total distance} \times \text{total time}$
- C$\text{average speed} = \dfrac{\text{total time}}{\text{total distance}}$
- D$\text{average speed} = \text{total distance} + \text{total time}$