What is Asafa Powell time in the 40 yard dash?

In his 9.74 run(you know the one where he started walking after 70m) his 40m split(subtracting reaction time) was, give or take, 4.39. This means he ran a 4.39 in 43.75 yards. At this same pace for 40 yards, he would've ran a 4.01 40 yd dash !!. pretty quick huh?