A boy covers $400\,\text{m}$ at an average speed of $4.0\,\text{m s}^{-1}$. He covers the first $200\,\text{m}$ in $40\,\text{s}$. How long does he take to cover the second $200\,\text{m}$?
- A$60\,\text{s}$
- B$66.7\,\text{s}$
- C$80\,\text{s}$
- D$140\,\text{s}$