Consider a wave described by the wave function y$($x$,$t$)=0\mathrm{.}3$msin$(2\mathrm{.}00$m$^\{-1\}$x$-628\mathrm{.}00$s$^\{-1\}$t$).($a$)$ How many crests pass by an observer at a fixed location in $2\mathrm{.}00$ minutes? $($b$)$ How far has the wave traveled in that time?