Question 7 (Mandatory) (4 points) A car repair shop has two adjacent garages where cars can be taken for repair work. Currently one garage is dedicated for routine repair and one for major repairs. Customers arrive daily at a rate of 5 per hour. A study indicates that 4 of the 5 are usually routine repairs and 1 requires major work. Assume it has been found that customers that require routine work spend 2 hours (total) in the shop and those that come for major work spend 3 hours (total). How long do all customers spend (total time) on average in the shop? a) 2 hours b) 2.5 hours c) 2.1 hours d) 2.2 hours