A Service Counter Employs Two Servers

Multiple Choice

A service counter employs two servers.On average,a server requires 8 minutes to process a customer and service times follow an exponential distribution.Customers arrive at the counter at the rate of 12 per hour according to a Poisson distribution.The average amount of time spent by a customer waiting in line is approximately

A) 0.370 minutes
B) 2.844 minutes
C) 14.22 minutes
D) 22.20 minutes