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
That would be about 27.91 ft/sec and thus 19 mph
4.0 (4.0672512) seconds in the 40-yard dash.
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
13.4 miles per hour.
22.7 mph
4.5 seconds in the 40-yard dash is a pace of 18.18 mph
Running a 40-yard dash in 4.2 seconds equates to a pace of 19.48 miles per hour.
Because they dash for 40 yards.
Running 40 yards in 4.2 seconds is equal to running 19.5 MPH.
61.7 MPH on the 40 yard dash and a 1:34 mile
A sub 5.7 40 time, bro Stephen Curry runs 10 MPH
7.2 seconds in the 55 meters converts to 4.788 seconds in the 40-yard dash.
He ran a 4.4 40 yard dash
His 5.0 40-meter dash translates to a time of 4.572 seconds in the 40-yard dash.
That would be about 27.91 ft/sec and thus 19 mph