In sprint, Is there any way to calculate the effect of each competitors' speed with one another?

Question

I so believe that the performance of a runner is affected by other competitors especially that which set the pace of the race?

Answer 1

When you run with faster people your times tend to be faster.

Just look at whats been happening in all the swimming events.  

Answer 2

Yes, look in their eyes - if the pupils are wide open and they seem to be bouncing off the walls they are on speed.