The three$-$station work cell illustrated in the figure below has a product that must go through one of the two machines at station $1($they are parallel$)$ before proceeding to station $2.$

Capacity: $30$ units$/$hr

Capacity: $30$ units$/$hr

a$)$ The process time of the system is minutes per unit. $($Enter your response as a whole number.$)$

b$)$ is the bottleneck station, at minutes per unit. $($Enter your response as a whole number.$)$