A small gas station has only one pump to serve its customers. Each arriving car is served on the average in 8 minutes where the service time has been found to follow the exponential distribution. The cars arrive according to a Poisson distribution at an average rate of 5 cars per hour. The gas station owner would like to offer a number of parking spaces for its facility such that her customers can wait inside the gas station instead of burdening the street outside the station. Analyze the system and offer a reasonable number of parking spaces for this gas station. Assume that the cars that cannot park inside the gas station they can wait outside until they enter the gas station.