$15\mathrm{.}28($A$)$ Three models, A$,$ B$,$ and C$,$ will be produced on a mixed$-$model assembly line. Hourly

production rate and work content time for model A are $10$unit$\frac{s}{h}r$ and $45\mathrm{.}0$min; for model

B are $20$unit$\frac{s}{h}r$ and $35\mathrm{.}0$min; and for model $C$ are $30$unit$\frac{s}{h}r$ and $25\mathrm{.}0$min. Line efficiency

is $95\%,$ balance efficiency is $0\mathrm{.}94,$ repositioning efficiency $=0\mathrm{.}93,$ and manning level $=1\mathrm{.}3.$

Determine how many workers and workstations must be on the production line in order to

produce this workload. The correct answer is w $=39$ workstations and n $=30$ stations.