It would be taking the median, since the data distribution is skewed to the right. The reason for this is that half of the numbers occupy a small space of between 7 and 8. Therefore, the extreme values on the right can give you a misrepresentation of the data if you use the mean, which is why is would be more accurate to use the median instead of the mean.
The rate of motion is defined as the quotient between the distance covered (in our case 16 feet) divided by the time it took to cover that distance (in our case 8 minutes)
