Im fairly sure that its frequency multiplied by wavelength. Frequency is essentially waves per second, since hertz is cycles per second, so its distance (metres) times frequency (cycles per second), which gives speed (metres per second).
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speed= frqquency*wavelength
The product of (wavelength x frequency) is the wave's speed.
frequency = speed of wave / wavelength so if speed is constant then frequency varies inversely with wavelength
wave length = wave speed divided by its frequency
The speed of any wave is the product of (wavelength) x (frequency) .