Isn't the speed of sound measured at mean sea level?
Anyway, if you wanted it in
lightyears/time then your answer would be about 3.51315343847 x 10^ -14 lightyears/hour (measured at sea level), hehe.
Wow that looks a lot slower now doesn't it?
[This message has been edited by Unit 5302 (edited 02-01-2001).]