Two sonometer wires A and B are fixed on a sonometer. The ratio of their lengths, diameters, densities and tensions are given below: $\frac{l_A}{l_B} = \frac{35}{36}$, $\frac{d_A}{d_B} = 4$, $\frac{T_A}{T_B} = 8$, $\frac{\rho_A}{\rho_B} = \frac{3}{4}$. If the higher frequency among the two wires is 360 Hz, then what is the beat frequency (in Hz) observed when the two wires are sounded together?