In 2003 at Holloman Air Force Base in New Mexico, test engineers set a world record by moving 192 lb payload at 6,453 miles per hour in a rocket sled. The rocket sled track, built in 1954, is 15.44 km in length. Assume the sled moved at the maximum speed for the entire length of the track, how long (in seconds) would it take for the sled to reach the end of the track?