Finding speed of sound in an object

[kathyt.25]

Homework Statement

"A hammer taps on the end of a 4.17 m long metal bar at room temperature. A microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. The pulses are separated in time by 6.64 ms. What is the speed of sound in this metal?(the speed of sound in air is 343 m/s)"

Homework Equations

v=d/t

The Attempt at a Solution

I tried approaching this question by finding the amount of time it takes each sound to travel the total distance, 4.17m.
v(air) = d /t
t = d/v = 4.17 / 343 = 0.01216s
v(metal) = d/t = 4.17 / (0.006640 + 0.01216) = 221.8m/s

Still not getting the right answer though...

 

[diazona]

Would sound travel faster through air or through metal?

 

[kathyt.25]

Would sound travel faster through air or through metal?

Yeah, I just realized my mistake after I posted the question. I couldn't figure out how to delete a post.

Thanks, though!