The speed of sound in air at 20 degrees Celsius (68 degrees Fahrenheit) is approximately 343 meters per second.

However, the speed of sound can vary depending on:

* Temperature: Sound travels faster in warmer air.

* Medium: Sound travels at different speeds in different substances (e.g., water, steel).

Here are some examples:

* Water: 1482 m/s

* Steel: 5960 m/s

Let me know if you need the speed of sound in a specific medium or at a different temperature!