A sound pulse is emitted from the underside of a boat. It moves through the water and is then reflected by the sea-bed. After $1.3\,\text{s}$, the sound returns to the boat. The sea-bed is $1000\,\text{m}$ beneath the boat. Using this information, what is the speed of sound in the water?
- A$770\,\text{m s}^{-1}$
- B$1300\,\text{m s}^{-1}$
- C$1500\,\text{m s}^{-1}$
- D$2600\,\text{m s}^{-1}$