# The wavelengths of two notes in air are $\large\frac{36}{195}$$m and \large\frac{36}{193}$$m$. Each note produces 10 beats per second separately with a third note of fixed frequency.The velocity of sound in air in m/s is :

$\begin {array} {1 1} (a)\;330 & \quad (b)\;340 \\ (c)\;350 & \quad (d)\;360 \end {array}$

Ans : (d)
360