a$)$ Two production lines $($A and B$)$ supply subassemblies to the final assembly stage. Line A

consists of four yerkstations with processing times $($min$)$ of $15,10,18,$ and $20.$ Line B

consists of five workstations with processing time $($min$)$ of $10,12,15,$ and $13.$ Determine

the "practical" output rate of the final assembly stage and recommend a suitable WIP for

each line. Assembly operation takes $10$ minutes.

$(10$ marks$)$