The figure below shows the flow of a car wash process that has three stations; vacuum, wash, and dry. The numbers in parentheses are the times in minutes for each step of the process. Answer parts a, b, and c assuming that a car can advance to the next station as soon as the next station is ready (idle).
a) What is the throughput time to complete a car wash when there are no waiting lines?
b) What is the capacity of the car wash process?
c) How would the capacity of the system change if another wash station is added, i.e. what is the system capacity with two wash stations?
d) Assume the car wash station serves only one car at a time, i.e. the station will not start vacuuming the next car in the line until the one in the system has gone through all three processes (vacuum, wash, and dry). What would be the capacity of the system in this case? Vacuum (5 mins) Wash (10 mins) mins) Dry (6 mins) mins) (This question was posted twice, but not answered?)