Two wires are parallel, and one is directly above the other. Each has a length of $50.0 \mathrm{~m}$ and a mass per unit length of $0.020 \mathrm{~kg} / \mathrm{m}$. However, the tension in wire $\mathrm{A}$ is $6.00 \times 10^{2} \mathrm{~N}$, and the tension in wire $B$ is $3.00 \times 10^{2} \mathrm{~N}$. Transverse wave pulses are generated simultaneously, one at the left end of wire $\mathrm{A}$ and one at the right end of wire $\mathrm{B}$. The pulses travel toward each other. How much time does it take until the pulses pass each other?