It takes a total of 400 seconds for one technician, working alone, to assemble one AirRules smartphone. However, AirRules manufactures its smartphones with 20 technicians staffing a 20-station assembly line, producing one smartphone every 30 seconds. Based on this information,

a. How many hours must AirRules operate its assembly line to create 1,200 smart- phones daily?

b. What is the theoretical minimum number of workstations for an assembly line supporting the AirRules smartphone production described here?

c. How efficient is the AirRules smartphone assembly line?