If a greyhound runs 515 meters at track A in 31.50 seconds (track record 30,20 seconds)
and he is to run 460 metres at track B (track record 27.80 seconds)
What is the equation to estimate his time over this new distance at track B ?

Find the speed in terms of the distance and the time it takes.

Then use that speed to get the time it would take for the second track.

You will get an estimate which will be most likely above the true time the hound would take.