The greatest average speed for a race car in the Daytona 500 is 286 km/h, which was achieved in 1980. Suppose a race car moving at this speed is in second place, being 0.750 km behind a car that is moving at a speed of 252 km/h. How long will it take the second-place car to catch up to the first-place car?
286km/hr = 286 x 1 hr / 3600sec = about .0794 km/sec
252 km/hr = 252 x 1 hr / 3600sec = about .0625 km/s
So......the faster car moves at about .0794 - ..0625 = 0.0169 km /sec faster than the slower one
Then...it will take the faster car 0.750 km / 0.0169 km /sec = about 44.38 seconds to catch the slower car