At $t = 0$, a goods train moves past a station at steady speed of $10\,\text{m s}^{-1}$. An express train is stationary at the station. As the goods train passes, the express train starts from the station with a constant acceleration of $0.5\,\text{m s}^{-2}$. The two trains travel in the same direction on straight, parallel tracks. At what time $t$ does the express train overtake the goods train?
- A$6\,\text{s}$
- B$10\,\text{s}$
- C$20\,\text{s}$
- D$40\,\text{s}$