Student 1 and student 2 are separated by $170\,\text{m}$, as illustrated. Student 1 sets off a starting pistol. Student 2 receives the sound two times: first along the direct path and then after it reflects from the wall. The speed of sound in air is $340\,\text{m s}^{-1}$. What is the time gap between the two sounds being heard?
- A$0.25\,\text{s}$
- B$0.50\,\text{s}$
- C$1.0\,\text{s}$
- D$2.0\,\text{s}$