Answer
The wavelength of the radio waves is $3.3~m$
Work Step by Step
We can find the wavelength of the radio waves:
$\lambda~f = c$
$\lambda = \frac{c}{f}$
$\lambda = \frac{3.0\times 10^8~m/s}{90\times 10^6~Hz}$
$\lambda = 3.3~m$
The wavelength of the radio waves is $3.3~m$
