I want to know the answer to the following question:
Starting in the center of Kathmandu, how many kilometers must one travel to reach Tribhuvan International Airport?
All the background I'm provided with is that "A recent extension to the international terminal has made the distance to the airplanes shorter and in October 2009 it became possible to fly directly to Kathmandu from Amsterdam with Arkefly.". Is that enough to answer the question?