The frequency of a sound wave has 1000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?

Question

$\begin{array}{1 1} (a)\;\text{3s approx} \\ (b)\; \text{2s approx} \\ (c)\; \text{10s approx} \\ (d)\; \text{8s approx} \end{array}$