How long would it take a sound wave to travel through 13229-meters of concrete?

The speed of sound in concrete lies in the range   3200m/s to 3600m/s                  (see http://www.engineeringtoolbox.com/sound-speed-solids-d_713.html).

 

travel time = distance/speed, so 

travel time is between 13229/3600 seconds and 13229/3200 seconds

.