The amplitude of wave disturbance propagating in the positive x...

The amplitude of wave disturbance propagating in the positive $x$-direction is given by $y = \dfrac{1}{( 1 + x{)}^{2}}$ at time $t = 0$ and $y = \dfrac{1}{1 + ( x - 2{)}^{2}}$ at $t = 1s$, where $x$ and $y$ are in metres. The shape of wave does not change during the propagation. The velocity of the wave will be $m{s}^{- 1} .$