First, find the speed of the sound at the given temperature.
[tex]\begin{gathered} v=331+0.6T \\ v=331+0.6\cdot4.24_{} \\ v=333.54\cdot\frac{m}{s} \end{gathered}[/tex]Observe that we used the temperature in Celcius, not Fahrenheit.
[tex]C=\frac{5}{9}\cdot(39.64-32)=4.24[/tex]Then, we use the constant motion formula to find the time.
[tex]\begin{gathered} t=\frac{d}{v}=\frac{2113m}{333.54\cdot\frac{m}{s}} \\ t=6.34\sec \end{gathered}[/tex]Therefore, it would take 6.34 seconds to hear the sound.
