i'm not sure why you'd want to know the offense's speed in mph tho. 1 mile is like, over 17 and a half football fields.
yards per minute is an interesting stat tho.
for that particular opening drive, KSU averaged 4.56 yards/min
for the game, KSU averaged 9.46 yards/min
some of last week's games for comparison:
TCU: 6.99 yards/min
KU: 9.58 yards/min
Oklahoma: 11.85 yards/min
Iowa State: 13.31 yards/min
West Virginia: 13.36 yards/min
Oklahoma State: 13.49 yards/min
Texas: 14.40 yards/min
Texas Tech: 16.44 yards/min
Baylor: 28.33 yards/min
