Question $13$

A process requires $6$ tasks, A$,$ B$,$ C$,$ D$,$ E and F$,$ that must be performed in that order. Currently there are $3$ skilled at each task. Employee $1$ is assigned tasks A and $B,$ employee $2$ is assigned tasks $C$ and $D$ and emF and $F.$ The task times $($all in seconds$)$ are given in the process table below. For example, task A requires $9$ Suppose the system started without any work in process inventory $($i$.$e$.,$ an empty system$).$ How long produce $9$ units $($in seconds$)?$

$\backslash$table$[[,,,$C$,$D$,E$