This is all guess work but the camera seemed to be at roughly the half way point and as they ran past it, Levrone seemed to be about 3-4 meters down. Extrapolating to 60 meters he may have lost by about 10 meters(since Levrone would have surely struggled to keep form and the fact that Chambers with probably one of the worst starts of top class sprinters has tremendous pickup which he uses to pull away in most races) which is a huge loss in the world of sprinting where athletes usually win by hundredths of a second. However, to be even that close to world class sprinter is a massive achievement and he has to be ranked as damn quick! Mind you if he decided to switch to athletics he'd have to watch out for all that drug testing