At what speed does sound travel?

The speed of sound in air at sea level and at a temperature of approximately 20 degrees Celsius is commonly accepted to be around 343 meters per second. This value can vary slightly based on temperature, humidity, and altitude, but 343 m/s is a standard reference for sound speed in dry air under typical conditions.

Therefore, the correct answer is the option that closely represents this standard, which is 343 m/s, while the other speeds provided do not align with the established scientific understanding of sound propagation in air.