Oscillations and Waves: JEE Main 2026 Physics question

Two strings (A, B) having linear densities $\mu_A=2\times10^{-4}$ kg/m and $\mu_B=4\times10^{-4}$ kg/m and lengths $L_A=2.5$ m and $L_B=1.5$ m respectively are joined. Free ends of A and B are tied to two rigid supports C and D, respectively creating a tension of 500 N in the wire. Two identical pulses, sent from C and D ends, take time $t_1$ and $t_2$, respectively, to reach the joint. The ratio $t_1/t_2$ is :