A transverse wave on a string is described by \( y = 3 \sin(36t + 0.018x + \pi/4) \), where \( x, y \) are in \( \text{cm} \) and \( t \) in seconds. The least distance between the two successive crests in the wave is_____ \( \text{cm} \). (Nearest integer)
(\( \pi = 3.14 \))
