Question: =12-18 For the post office in Problem 12-17, a second drivethrough window is being considered. A single line would be formed and as a car

=12-18 For the post office in Problem 12-17, a second drivethrough window is being considered. A single line would be formed and as a car reached the front of the line it would go to the next available clerk. The clerk at the new window works at the same rate as the current one.

(a) What is the average time a car is in the system?

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