Pulse transmission

A triangular deformation (a pulse) is travelling on a tightened string with the speed \( 5~\mbox{m/s}\). The length of the base of the triangle is \(30~\mbox{cm}\). The pulse suddenly reaches a point where the wire connects to a different wire made out of a different material. The pulses travel with the speed \( 7~\mbox{m/s}\) in this material. What will be the length of the base of the triangle (length of the pulse) in cm on the other wire?

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