Timbuktu Tea (TT) is a recently opened beverage and eatery place in Mali. They don't have an app or drive-thru. They serve walk-in customers. Assume that yesterday, TT had five customers between 2 and 3 pm local time. The arrival and service times of these five customers are shown below. Please take into account the following assumptions before answering the question below the table. Timbuktu Tea's queuing system operates differently from the M/M/1 model. There is only one barista who tirelessly makes and sells beverages during this hour. The barista needs to complete one customer's order before moving on to the next. Customer Number Arrival Time Service Time Service Ends 1 2:06 PM 2 2:08 PM 2 2:07 PM 10 2:18 PM 3 2:12 PM 10 2:28 PM 4 2:24 PM 11 2:39 PM 5 2:30 PM 7 2:46 PM Given the aforementioned information, what is the average time a customer spends at Timbuktu Tea from arrival to completion of service? Group of answer choices 7 minutes 9 minutes 12 minutes 16 minutes