At a McDonald’s branch, cars arrive at the Drive-Thru at a rate of 25 per hour and only one drive-thru till is open and the average time it takes for order and collection is 5 minutes. Assuming that the interarrival time and the service time are both exponentially distributed. What is the average number of customers at the till and the average time they have to wait before existing McDonald’s Drive-Thru? (500 words)
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