Answer
The wavelength is $0.375~m$
Work Step by Step
We can find the wavelength:
$\lambda~f = v$
$\lambda = \frac{v}{f}$
$\lambda = \frac{v}{1/T}$
$\lambda = v~T$
$\lambda = (75.0~m/s)(5.00\times 10^{-3}~s)$
$\lambda = 0.375~m$
The wavelength is $0.375~m$
