Answer:
a. 6.72 minutes
Step-by-step explanation:
There is total weekly demand for 1000 boxes. The production is assumed to be same as the weekly demand. The factory workers have two shifts for 5 days. The total hours which factory workers work every week is :
5 days * 7.5 hours * 2 shifts = 75 hours per week
1000 / 75 hours = 13.33
13.33 / 2 = 6.72 minutes