Answer
$243.89\space m/s$
Work Step by Step
Here we use the equation $V=f\lambda$ to find the wave speed on Mars, where V - speed of the sound wave, f - frequency, $\lambda$ - Wavelength.
$V=f\lambda$ ; Let's plug known values into this equation
$V=482\space s^{-1}\times50.6\times10^{-2}m$
$V=243.89\space m/s$
