Respuesta :

The velocity of the sound will be 329 meters per second at -2.3975 degree Celsius.

[tex]v=20 \sqrt{273+t} \\ \\ 329=20 \sqrt{273+t} \\ \\ 16.45 =\sqrt{273+t} \\ \\ 270.6025=273+t \\ \\ t=-2.3975 [/tex]

This solution can also be seen from graph attached below. The blue horizontal line shows the velocity equal to 329 meter per second. 
Ver imagen 11beehshahbaz