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Sound travels at different speed in different media. It travels the fastest in solids and the slowest in gases. It will travel at a different speed in different gases.
The speed of sound in air can be determined by:
v = (331 + 0.610t) m/s where t is the temperature in degrees Celsius, or v = 20.0 ms-1K-½, where T is the temperature in Kelvin.
This is a very general "rule of thumb formula" for use by lay persons. It usually equates to about 339.7 meters per second.
It does not take into consideration the altitude nor the pressure (usually measured in Pascals or millibars). Both of these factors will effect the speed of sound, but not significantly for this topic.
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