To determine the first and last place times, we need to identify the fastest and slowest times from the given times:
- 31.18 seconds
- 27.9 seconds
- 32.41 seconds
- 29.7 seconds
The fastest time (first place) is 27.9 seconds, and the slowest time (last place) is 32.41 seconds.
Therefore, the correct response is: First place: 27.9 seconds; last place: 32.41 seconds.