Originally Posted by moeee

You are trying to complicate things by comparing 2 dissimilar items.
If you wish to know exactly what time an animal took to run the complete 525 metres , then you have to keep running the tape until that animal crosses the finishing line and then seeing what time has elapsed.

Because most of us don't have access , and don't care to go to so much trouble to set up the software to do this , we find a very close approximation is arrived at using the method Tijuana describes.