Consider a $3-$step manufacturing process where...

step $1$ has a capacity of $200$ units$/$hr

step $2$ has a capacity of $250$ units$/$hr

Step $3$ is a batch process with the following characterisitics: Batch Size $=90$ units Setup Time $=15$ mins Processing Time $=15$ mins $($processing time is independent of batch size$)$

What is the capacity $($in units$/$hr$)$ of Step $3?$

A$.180$ units$/$hr

B$.3$ units$/$hr

C$.90$ units$/$hr

D$.6$ units$/$hr