4.5 seconds
4.87
5.29
At the 2005 NFL Combine, Vincent Jackson ran the 40-yard dash in 4.46 seconds.
Brian Westbrook's 40 yd dash time was 4.57
4.51 40 yd. dash. That was his time when he ran for the scouts coming out of college.
4.42 seconds
4.0
According to several online sources, Bob Hayes' time in the 40 yard dash wasn't recorded. See The Fastest 40 Yard Dash Ever.
40 yard dash/10 yard dash= 4 What ever the time you got for the ten yard, you multiple it by 4. It could be an average of your running time per 10 yard dash. Sometimes for several runners, they would feel worn out by the time when reaching the 40 yard mark.
4.29 is his lowest
Maybe in Middle School. Or a low-end highschool team.
Running 40 yards in 4.2 seconds is equal to running 19.5 MPH.