How Do You Calculate the Distance of Sound Traveling Through Different Mediums?

[Boulderbison19]

so i have some questions on how to set up this one problem on my homework.

Here is the problem:

A person sees a heavy stone strike the concrete pavement. A moment later, two wounds are heard from the impace: one travels through the concrete and the other through air, and the sounds are heard 1.4 seconds apart. how far away did the impact occur?

i got the velocity in air to be 343 m/s and the velocity through concrete to be 2949 m/s by the elastic modulus equation. how would i go setting up equations for this problem? i tried T(in concrete)=T(in air)-1.4 and used D=D to set up

V(in air)T(in air)=V(in concrete)[T(in air)-1.4]

would this setup work, or would another set up work any better?

thanks

 

[Ja4Coltrane]

that's what I would do.

 

[Boulderbison19]

ok i got it. i just made a stupid mistake in solving the problem. thanks