given Consider a two$-$task process, consisting of

Task $1$: Assembly, followed by

Task $2$: Packing.

It takes $6$ minutes to assemble a unit at a Task $1$ workstation, and $5$ minutes to pack a unit at a Task $2$ workstation.

There are $5$ identical workstations for assembly $($i$.$e$.,5$ units can be assembled simultaneously$)$ and $4$ identical workstations for Packing $($i$.$e$.,4$ units can be packed simultaneously$).$If there is no waiting in the process, what is the throughput time in minutes for a unit to go through the process?

Please show how you calculated it$.$