An earthquake-monitoring station detects 16 full wavelengths of an earthquake wave during a time interval of $20\,\text{s}$. The speed of the earthquake wave is $6.0\,\text{km/s}$. What is the wavelength of the earthquake wave?
- A$1.3 \times 10^{-4}\,\text{m}$
- B$2.1 \times 10^{-4}\,\text{m}$
- C$4.8 \times 10^{3}\,\text{m}$
- D$7.5 \times 10^{3}\,\text{m}$