References
The Missile Defense Equation: Factors for Decision Making by Peter J. Mantle

Flight Times of Ballistic Missiles lofted in Maximum-Range Trajectories

Flight_Time = SQRT (Range) * 14

where

Flight_Time is in seconds
Range is in kilometers

Speeds of Ballistic Missiles lofted in Maximum-Range Trajectories

Speed = SQRT (Range) * 0.09

where

Speed is in km/sec
Range is in kilometers

Apogees of Ballistic Missiles lofted in Maximum-Range Trajectories

Apogee = Range * 0.25

where

Apogee is in kilometers
Range is in kilometers