4.4 40yd speed
3.96s, assuming that you ran at a constant speed the entire time.
Chris Johnson: with a speed of a 4.2 40yd dash if he can keep that constant speed for 100 yards he can cover a entire football field within 10-10.5 secs flat
he ran a 2.63 once
In his rookie camp in 2001 he ran a 4.36
1yd = 10.50 40yd = 420 50yd = 525 100yd = 1,050 You just have to multiply 10.50 by the amount of yd, 10.50 x 40, 10.50 x 50, and 10.50 x 100
A VERY fast time is 5.3. I run 5.45, average is 5.9
Jacoby Ford of the Oakland Raiders who ran a 40yd dash time of 4.26 at the combine
Adam Podlesh ran a 4.44 40yd dash so I think he's one of the fastest.
usian bolt's 40yd dash time is 4.38. and if your running a 4.9 that is considered quite good. Now if your doing a 60yd a real good time is 6.7. a good time is 7 and so on and so on.