Acopper rod at 25°c is 1.5 m long. how long would it take a sound to move through the rod from one end to another? how would i do this?

Speed of sound in copper at normal temperature ( 293.15 K ) is:
v = 3,570 m / s
L = 1.5 m
t = L / v = 1.5 m / 3,570 m/s
t = 0.00042 s = 4.2 * 10^(-4) s 

Cpowerlifting my boi