Consider two digital fuel pumps A and B that could be used in a single gas station. Pump A has a mean effective process time of 4 minutes with squared-coefficient of variation of 0.5. Pump B has a mean effective time of 3 minute with squared-coefficient of variation of 5.

(a) Assume that the arrival rate of cars is 0.2 car per minute with squared-coefficient of variation of 1. Which pump will have a longer average cycle time? (Hint: the number of machines, m, is 1.)

(b) Now assume that the number of pumps in the gas station could be four (four pumps of A or two pumps of B). What will happen to cycle time if the arrival rate of cars is doubled?

(Pump A) te: ce2: ra: ca2 u: CTq: CT: (Pump B) te: ce2 ra: ca2:u: CTq:CT: (Pump A) te: ce2: ra: ca2 u: CTq: CT: (Pump B) te: ce2 ra: ca2:u: CTq:CT