To determine the depth of the sea, a ship emits an ultrasound pulse towards the seabed. The speed of ultrasound waves in sea water is $1500\,\text{m s}^{-1}$. The pulse requires $4.6\,\text{s}$ for the journey to the seabed and back to the ship. What is the depth of the sea?
- A$330\,\text{m}$
- B$650\,\text{m}$
- C$3500\,\text{m}$
- D$6900\,\text{m}$