A quick oil change company employs 3 people to change the automobile oil for its customers. Before the customer can get their oil changed, they first meet with the manager to get all needed information, averaging 1 minute for this process. Once the customer completes order entry, it takes an average of 25 minutes to the complete the oil change. After this, the customer meets with the manager again and it takes 3 minutes to complete the payment process. On average, 5 customers arrive at the company per hour. Based on this, what is the average number of customers physically inside the company?
a) 2.42 b) 5.00 c) 10.30 d) 2.08