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Another quick physics problems (wave motion)

A 30.0 m steel wire and a 20.0 m copper wire, both with 1.00-mm diameters are connected end to end and stretched to a tension of 150 N. How long does it take a transverse wave to travel the entire length of the two wires?
I really dont need an answer but rather something to get me going.
 

Doc Al

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The speed of the wave depends on the tension and the mass per length:
[tex]v = \sqrt{\frac{T}{(M/L)}}[/tex]
Where T = tension, M/L = mass per unit length of the wire.
 

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