Horton Williams Airport is a small municipal airport with two runways. One of these runways is devoted just to planes taking off. During peak time periods, about 8.5 planes per hour radio to the tower that they want to take off. The tower handles these requests in the order they arrive. Once the tower has given the go-ahead, it takes the plane, on average, five minutes to position itself on the runway and take off.
a. On average, how many planes will be waiting during peak time periods? How many will be in the sys- tem (waiting and on the runway)?
b. How long, on average, will a plane have to wait before it is allowed to take off?