A ship’s horn produces a sound. The captain aboard the ship hears an echo from a cliff $4.0\ \text{s}$ later. The speed of sound is $340\ \text{m s}^{-1}$. Calculate the distance from the ship to the cliff.
- A$170\ \text{m}$
- B$340\ \text{m}$
- C$680\ \text{m}$
- D$1400\ \text{m}$