A transverse harmonic wave on a string is given by $\mathrm{y}(\mathrm{x},\mathrm{t})=5\sin (6\mathrm{t}+0.003\mathrm{x})$ Where x and y  are in cm and t in sec. The wave velocity is $\_\_\_\_\_\_\_\_{\mathrm{ms}}^{-1}\text{. }$