During the early morning hours, customers arrive at a branch post office at the average rate of 45 per hour (exponential interarrival times), while clerks can handle transactions on an average of 4 minutes each (exponential).
What is the minimum number of clerks needed to keep the average time in the system under 5 minutes?
A) 2
B) 3
C) 4
D) 5
E) 6

Question

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The Answer of During the early morning hours, customers arrive at a branch post office at the average rate of 45 per hour (exponential interarrival times), while clerks can handle transactions on an average of 4 minutes each (exponential).
What is the minimum number of clerks needed to keep the average time in the system under 5 minutes?
A) 2
B) 3
C) 4
D) 5
E) 6

During the Early Morning Hours, Customers Arrive at a Branch