From Round Rock you'd likely go IH35 to 195 on the north side of Georgetown, and then 195 to Killeen. If you're working normal hours you'd be going against the traffic for a good deal of that.
After analysis, unknown prints are compared alongside the known prints. The unknown print is the print found at the crime scene, and the known print is the print of a possible suspect. First, the class characteristics are compared.
However, a positive match is not tell-all proof that the suspect committed a crime. Fingerprints are hard to get rid of, meaning the print lifted could be from the day the crime was committed or years beforehand. The fingerprint match only proves that at some point, the suspect was at the crime scene, not when.