I'll risk looking incompetent because I know I don't know:
1) No appreciable difference
3) Half a second to turn around
4) The big fat man will be a bit slower than average
5) The reactino time will be about 0.25 seconds
The only one I have any confidence in is 5, and that's not much confidence at all.
I'm very curious to see the range of answers we get before the solutions are posted. This is fun.