Part $1$: A production line has two stations in tandem$.$ Suppose the first workstation has a very steady processing time, $0\mathrm{.}25$ hr$/$job $($without variation$).$ The second station prints a single$-$color mark on the product, which takes $0\mathrm{.}1$ hr$/$job$,$ with ce $2=0\mathrm{.}01.$ To change color at the second station, it takes $5$ hours. $[$Hint: Focus on Station #$2.$ Output of Station #$1$ is the arrival of Station #$2.]$