To convert a 40-yard dash time to miles per hour (mph), you need to first convert the distance to miles. There are 1,760 yards in a mile, so 40 yards is 40/1760 = 0.0227 miles. Next, you need to calculate the time it took to cover this distance. A 5.1-second 40-yard dash translates to 5.1/3600 = 0.00142 hours. Finally, divide the distance by the time to get the speed: 0.0227 miles / 0.00142 hours = 15.99 mph. Therefore, a 5.1-second 40-yard dash is equivalent to approximately 15.99 mph.
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40 yards = 120 feet = 120/5280 = .0227 miles
speed = distance /time = .0227/5.1 = .00445 miles per second
At 3660 seconds per hour, that is
.00445 x 3600 = 16 mph
4.0 (4.0672512) seconds in the 40-yard dash.
Oh, dude, a 4.3 40-yard dash? That's like lightning speed, man! You're covering 40 yards in just 4.3 seconds, which means you're booking it at about 9.3 meters per second. So yeah, you're basically the Flash out there on the football field.
A 4.48 40 equates to a time of 12.248 seconds for the 100m
At a constant speed it would be 4.36, but in reality your speed would change and you have to start at being stationary and so would be accelerating at 40 yards, so it is not a definitive answer.
13.5 mph