For example, if a wavelength has a frequency of 120 HZ and a wavelength of 5m, it would have a speed of 600

m/s.
And two sentences describe what would happen to the frequency of this wave, if the wave blink is in increased to 10m but the speed stays the same at 600 m/s

If the wavelength is increased to 10m while the speed remains the same at 600 m/s, the frequency of the wave would decrease to 60 Hz. This is because frequency is inversely proportional to wavelength when speed is constant.