A boy is standing $150\,\text{m}$ away from a wall. He gives a clap, and as soon as he hears the echo, he claps again straight away. He carries on doing this for a while. Another student is using a stop-watch. She begins timing at the first clap and stops it at the eleventh clap. The stop-watch shows $10.0\,\text{s}$. What value do her measurements produce for the speed of sound in air?
- A$150\,\text{m s}^{-1}$
- B$170\,\text{m s}^{-1}$
- C$300\,\text{m s}^{-1}$
- D$330\,\text{m s}^{-1}$