Speed of wave (e.g. m/s) = wavelength (m) x number of waves per second (Hz)
So you can figure out any one of speed, wavelength or frequency if you know the other two. Often, you know the speed (e.g. light, 3x10^8 m/s, or sound, 340 m/s).
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The product of (wavelength x frequency) is the wave's speed.
The speed of any wave is the product of (wavelength) x (frequency) .
frequency = speed of wave / wavelength so if speed is constant then frequency varies inversely with wavelength
Wavelength*Frequency = Velocity of the wave. or Wavelength/Period = Velocity of the wave.
Velocity = Frequency * Wavelength. If the wavelength increases and the frequency stays the same, then the speed of the wave will increase.