Equations of a stationary and a travelling waves are as follows `y_(1) = sin kx cos omega t` and `y_(2) = a sin ( omega t - kx)`. The phase difference between two points `x_(1) = pi//3k` and `x_(2) = 3 pi// 2k is phi_(1)` in the standing wave `(y_(1))` and is `phi_(2)` in the travelling wave `(y_(2))` then ratio `phi_(1)//phi_(2)` is