Answer
0.57 m.
Work Step by Step
The wave speed is frequency multiplied by wavelength.
$v = 340 \frac{m}{s} = f \lambda = (600 Hz)(\lambda )$.
Solve for $\lambda = \frac{340 m/s}{600 Hz} = 0.57 m$.
Alternatively, use $d = vt = (340 \frac{m}{s})(\frac{1}{600} s) = 0.57 m$.