d) how long on average will a plane have to wait before it is allowed to take off?

Horton Williams Airport is a small municipal airport with two runways. One of these runways is devoted to planes taking off. During peak time periods, about 9.5 planes per hour radio to the tower that they want to take off. The tower handles these requests in the order in which they arrive. Once the tower has given the go-ahead, it takes a plane, on average, 6 minutes to position itself on the runway and take off. a. The average number of planes waiting during peak time periods is (Enter your response rounded to two decimal places.) The average number of planes in the system (i.e., waiting and on the runway) is (Enter your response rounded to two decimal places.) b. On average, a plane will have to wait minutes before it is allowed to take off. (Enter your response rounded to one decimal place.) To deal with greater demand, Horton Williams Airport has opened a second runway devoted just to planes taking off. Peak demand has 16.5 planes per hour. Furthermore, each plane still takes about 6 minutes to position itself and take off once it has been given the go-ahead. c. The average number of planes waiting during peak time periods is now (Enter your response rounded to two decimal places.)