Help with 152 math

I looked at the timeline of the 152 "Attack"
http://abcnews.go.com/US/story?id=748233 (printed below)

I have a few questions?
given that the slowest practical weapon is about the speed of a 152 (100
kts) the slowest reasonable threat carrier moves at ~2 miles per minute

questions
1. how far away do controllers "notice" planes that are entering the
ADIZ? (how many minutes away is a threatening 152)

2. 15 miles at 11:59 and 10 miles at 12:01 (5 miles in 3 minutes): that
is heading pretty much right at the White House.
The airplane is 5 mins from the WH, and evacuation is ordered 3 minutes
later. How long does it take to evacuate 25000 people?

3. Did the fighters or blackhawk intercept the plane before or after the
threat was gone?

4. How does this math work with a kingair? When should we be evacuating
people? (or what's the point)








timeline...
11:28 a.m. ET
Controllers notice plane moving toward Air Defense Identification Zone.

11:55 a.m.
Blackhawk Helicopters dispatched.

11:58 a.m.
U.S. Capitol Police raise alert to highest internal level; evacuation
decision imminent.

Approximately 11:59 a.m.
Threat level at the White House is raised to yellow — a Cessna plane
was traveling 15 miles north of the White House.

Noon
F-16 fighter jets are scrambled from Andrews Air Force Base.

12:01 p.m.
Threat level at White House raised to orange — plane was within 10 miles.
Evacuation and moving of people to secure locations begins.
Cessna was traveling in restricted airspace toward the White House and
Capitol and the pilot was not responding to efforts to communicate with
the plane.

12:02 p.m.
Senate recesses without notice or explanation. Senate floor evacuated
amid fears of a bomb.

12:03 p.m.
Threat level raised to red — plane was within three miles of the White
House.

12:04 p.m.
U.S. Capitol Police order full evacuation of at least 25,000 people in
the Capitol, six Senate and House office buildings and the Supreme Court.

12:11 p.m.
Threat level brought down to yellow — plane turned west and was
traveling away from the White House.

12:14 p.m.
All clear at the White House.


12:37 p.m.
Cessna 152 lands in Frederick, Md.

Approximately 12:40 p.m.
All clear at the U.S. Capitol and Supreme Court.