ns2 is a game, right? (I'm an old guy so bear with me) It's no doubt in "Virtual space" so I doubt very much if you're going to get any sort of "real world" conversion factor.
From your figures it looks like the two nodes have three absolute co-ordinates to define their position? They're both the same height above "sea level" (Is there sea in ns2?) They're separated by 385 units in X and 382 units in Y and you can work out the angular relationship as well.
The units can probably be whatever you want to call them as it's a game; miles, kilometers, parsecs, etc.
With the info you've provided that's my best guess though I don't see the relevance of having to have real world units.
(I bet I've got what you want to know totally wrong!