Two identical wave pulses are propagating toward a wall, down a massive string, which has a tension of T=65.48 N and a mass per unit length of µ=1.32 kg/m. At t=0, the pulse peaks are separated by L1=0.751 m and the leading pulse is a distance of L2=0.464 m from the wall. At what time will the wave pulses cancel each other out? Express your answer in seconds.