A man notices a puff of smoke from a starting pistol, and then hears the pistol fire $1.5$ seconds later. The smoke and the sound are produced at the same instant. The starting pistol is $450$ metres from the man. From this observation, what is the calculated speed of sound?
- A$150\ \text{m s}^{-1}$
- B$300\ \text{m s}^{-1}$
- C$330\ \text{m s}^{-1}$
- D$625\ \text{m s}^{-1}$