please help me with this problem. A and C are correct, ( i just wanted you to see it). i need help with B and D pleaseeee.

A: this ones correct

B: need help with this one.

C: this one is correct.

D: need help with this one please.

For the Peachtree Airport problem, compute the average time (in hours) a plane must wait in line before it can land. It is (type number only, one decimal, no text) For the Peachtree Airport problem, compute the average time (in hours) it takes a plane to clear the runway once it has notified the airport that it is in the vicinity and wants to land. It is (type number only, no text) For the Peachtree Airport problem, compute the average number of planes that will stack up, waiting to land. It is (type number only, one decimal, no text) The Peachtree Airport in Atlanta serves light aircraft. It has a single runway and one air traffic controller to land planes. It takes an airplane 12 minutes to land and clear the runway. Planes arrive at the airport at the rate of four per hour. The service rate (\# of planes/hr) of the airport is (type number only, no text)