In an airport, a particular runway is used for arrivals only, and arriving aircraft join a single queue for the runway. Calculate the quantities of the queuing system, W, L , Wq and L q with the following data:

- I. Exponentially distributed service time with a rate = 27 arrivals / hour, and Poisson arrivals with a rate = 20 arrivals / hour.

II. Based on I, now suppose we are in holidays and the arrival rate increases, = 25 arrivals / hour, how will the quantities of the queueing system change?

III. Based on I, now suppose we have a bad weather, and the service rate decreases, = 22 arrivals / hour, how will the quantities of the queueing system change?