A String Is Strung Horizontally with a Fixed Tension

Multiple Choice

A string is strung horizontally with a fixed tension.A wave of frequency 60.0 Hz is sent along the string,and it has a wave speed of 58.4 m/s.Then a second wave,one of frequency 120 Hz,is sent along the string.What is the wave speed of the second wave?​

A) 29.2 m/s
B) 58.4 m/s
C) 117 m/s
D) 87.6 m/s
E) 234 m/s