I pulled up Googe Map Earth, and just spent an hour running all over Libya, large and small. It looks as though the distance from Benghazi to Tripoli is 900 miles, mostly through very barren desert land. I tried to find the Green Square in Tripoli, no luck. But I did find the Police Academy just north of the Zoo. Have fun yourself:
http://www.nationsonline.org/oneworld/map/google_map_earth.htm