To determine the winners, we need to identify the fastest time for first place and the slowest time for last place.
The recorded times are:
- 31.18 seconds
- 27.9 seconds
- 32.41 seconds
- 29.7 seconds
The fastest time (first place) is 27.9 seconds, while the slowest time (last place) is 32.41 seconds.
So, the correct response is: First place: 27.9 seconds; last place: 32.41 seconds.