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?
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Asafa Powell set a record in running 100 yards in 9.74 seconds. This means that he can run 40 yards in a matter of 4.01 seconds.