No; hertz is frequency.
Frequency times wavelength equals speed of travel.
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Just multiply the wavelength (in meters) with the frequency (in Hertz) to get the speed (in m/s).
You get a speed. If the 'Hertz' is the frequency of a particular wave, and the 'meters' is the wavelength of the same wave, then their product is the speed of that wave.
Frequency = speed divided by wavelength
331/20 = 16.55 meters.And by the way ... The hertz is not 20. The 'frequency' is 20 hertz.
Wavelength = speed/frequency = 30/10 = 3 meters