When the temperature of the air is 25 degrees Celsius the velocity of a sound wave traveling through the air is approximately

Assuming an ideal gas, the speed of sound depends on temperature

only. Air is almost an ideal gas.

Assuming the temperature of 25°C in a "standard atmosphere", the

density of air is 1.1644 kg/m3, and the speed of sound is 346.13 m/s.

The velocity can't be specified, since the question gives no information

regarding the direction of the sound.