Assume vacuum for the first 60,000 feet fall from 120k to 60k altitude. height= 1/2*a*t^2. a=32ft/sec^2. Thus, the time spent dropping from 120k feet to 60k feet is about 43 seconds. Multiply by the acceleration of 32 ft/s^2, and you get 1387 feet per second, or 945 mph. Of course, that assumes a vacuum, so the number may be lower, but we are at a velocity about mach 2 at sea level.
Fast!