Mathematically calculated Rose' 40 yard time is 4.48.
This was calculated by taken Chris Johnson's 20 yard time and Derrick Rose' 20 yard time of 2.65 in which i got from http://www.muscleprodigy.com/derrick-rose-workout-arcl-1189.html and subtracting the two times and I accumulated 0.24 I added 0.24 to Chris Johnson's 40-yard time and that equaled 4.48.
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Reggie Bush ran the 40 yard dash in 4.33 seconds! He also ran a 4.24 at a charity event!
Usain Bolt set the world record for the 100-meter dash in 2009 at 9.58seconds. It is believed that he could run the 40-meter dash in less than 4 seconds.