Scenario B.2 Weary Travelers Arrive at Will Rogers International Airport, Pick Up

Scenario B.2
Weary travelers arrive at Will Rogers International Airport, pick up their luggage, stumble to their cars, and proceed to the parking lot attendant to pay for their parking. Traveler interarrival times are exponentially distributed, as are the service times of the attendant. On average, travelers arrive every 25 seconds. The attendant can process three travelers per minute, and processing rates follow a Poisson distribution.
-Use the information in Scenario B.2. What is the average amount of time a customer spends waiting in line and being served?

A) less than or equal to 1.0 minutes
B) greater than 1.0 minutes but fewer than or equal to 1.50 minutes
C) greater than 1.5 minutes but fewer than or equal to 2.0 minutes
D) greater than 2.0 minutes