Suppose Bismarck Airport serves light aircraft. It has a single runway and one air traffic controller to land planes. It takes 12 minutes to clear the runway (service time). Planes arrive at the airport at the rate of 4 per hour (arrival time, this is in hours).

(Hint, service rate and arrival rates must be in the same unit).

a. Determine the average number of planes that will stack up waiting to land.

The average number of stacked-up planes is 3.2 (~3)

b. Find the average time a plane must wait in line before it can land.

The average waiting time is 0.80 hours.

c. Calculate the average time it takes a plane to clear the runway once it has notified the airport that it is in the vicinity and wants to land.