The wave speed can be calculated using the formula:
v = f * λ
where: v is the wave speed, f is the frequency of the wave, and λ is the wavelength of the wave.
Given that the frequency is 12 Hz and the wavelength is 3.0 m, we can substitute these values into the formula:
v = 12 Hz * 3.0 m v = 36 m/s
Therefore, the wave speed is 36 m/s.