Please help

Two wave pulses travel on a string. The picture shows the displacement of the string y as a function of x at t = 0. The velocities of the wave pulses are shown. y (cm) 1 cm/s x (cm) m A N + 1 cm/s At t = 2 s, what is the displacement of the string at the following values of x? At x = 3.5 cm, y = cm At x = 4.5 cm, y = cm At x = 5.5 cm, y = cm At t = 3 s, what is the displacement of the string at the following values of x? At x = 3.5 cm, y = cm At x = 4.5 cm, y = cm At x = 5.5 cm, y = cm