Answer: Given is the calculated distance as well as the driving travel time, which does not take into account driving conditions, traffic, etc. The distance between Waco, Texas and Killeen, Texas is 62.6 miles. The resulting travel time is 1 hour and 10 minutes.
This is the route:
Take I-35 SOUTH to U.S. 190 WEST to KILLEEN and FT. HOOD at EXIT 293A.