The speed of the sound through air if the temperature is 40 degrees celsius is

354.94 m/s

Temperature affects the speed of sound by changing the density of the medium in which a sound wave travels. Sound waves require a medium in order to travel. The speed of sound depends on both the elasticity and density of the medium. When the elasticity increases and density decreases of a medium, sound is allowed to travel faster. Higher temperatures lower the density of a medium, which puts less resistance on the sound waves and allows the sound to travel faster.