$5\mathrm{.}1$ The table below gives information for operations A and B which are required to

produce Part X on a lathe machine. The company operates $16$ hours per day for five

days a week with each split in to two $9$ hour shifts. The milling machine requires a $38$

minute tool change after every $220$ processed parts. There are $40$ minutes and $15$

minutes of mandatory lunch and tea breaks respectively per shift.

Operation Std Time Efficiency Reliability Defect Rate

A $7$ min $95\%80\%2\%$

B $5$ min $80\%95\%6\%$

$5\mathrm{.}1\mathrm{.}1$ Calculate the number of machines required to produce $6200$ parts per week.