Answer:
2.4564 m/s
Explanation:
Number of waves in 1 second
[tex]\dfrac{12}{45}=0.267\ Hz[/tex]
This is the frequency 0.267 Hz
The distance mentioned in the question is the
[tex]\lambda[/tex] = Wavelength = 9.2 m
The speed of wave is
[tex]v=f\lambda[/tex]
[tex]\Rightarrow v=0.267\times 9.2[/tex]
[tex]\Rightarrow v=2.4564\ m/s[/tex]
The speed of the wave is 2.4564 m/s