A process requires $6$ tasks, A B$,$ C$,$ D$,$ E and F$,$ that must be performed in that order. Currently there are $3$ employees that are equally skilled at each task. Employee $1$ is assigned tasks A and $B,$ employee $2$ is assigned tasks $C$ and $D$ and employee $3$ is assigned tasks $E$ and $F.$ The task times $($all in seconds$)$ are given in the process table below. For example, task A requires $90$ seconds.

Suppose the system started without any work in process inventory $($i$.$e$.,$ an empty system$).$ How long would this process take to produce $12$ units $($in seconds$)?$

$\backslash$table$[[$A$,B,$C$,$D$,E,F$