Travel Time of a Wave Pulse Through Two Steel Wires

thehabsonice
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A steel wire of length 5.0m and radius 0.300 mm is knotted to another steel wire of length 5.0m and radius 0.10 mm. The ires are strethed with a tension of 150 N. How long does a transverse wave pulse take to travel the distance of 10 m from the beginning of the first wire to the end of the other? The density of the steel is 7.8 x 10^ 3 (kg/m^3).I really don't know how to do this... can you guys tell me how to start it off please lol!
 
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it asks you for the time taken to travel a distance, what quantity does this remind you of... or how what would we usullay think when relating these 2 quantities
 
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