I anticipated a problem here. I felt that if we were fixing the distances and asking the students to measure the times we would be looking for trouble. Since we are measuring time it would be dependent and distance would be independent and we wanted this reversed for a quadratic relation.
So....I decided to create the data collection sheet for them. Here is what I came up with.
Here are two links to the actual race.
The next day I put all the data into a table.