. A rocket ascends vertically after being launched from a location that is midway between two ground?

Skill IVB2. A rocket ascends vertically after being launched from a location that is midway between two ground-based tracking stations. When the rocket reaches an altitude of 12 kilometers it is 13 kilometers from each of the tracking stations. How far apart are the two tracking stations? ume that this is a locale where the terrain is flat.