Station A has $3$ parallel operators, A$1,$ A$2,$ and A$3.$ Station C has $2$ parallel operators, C$1$ and C$2.$ Each unit only needs to be processed by one of the operators A$1,$ A$2$ and A$3.$ After being processed at Station B $($with a single operator$),$ a unit then needs to be processed by either C$1$ or C$2.$ The process time of the individual operators are given as follows. Each of A$1,$ A$2,$ and A$3$: $12$ minutes B: $11$ minutes Either of C$1$ and C$2$: $2$ minutes.It is observed that the utilization of Station B is $72\%.$ What is the throughput rate $($in units$/$hour$)$ of this process?