Benny's Arcade has five video game machines. The average time between machine failures is 40 hours. Jimmy, the maintenance engineer, can repair a machine in 15 hours on average. The machines have an exponential failure distribution, and Jimmy has an exponential service-time distribution. a. Jimmy's utilization is (Enter your response rounded to three decimal places.) b. The average number of machines out of service, that is, waiting to be repaired or being repaired is machines. (Enter your response rounded to two decimal places.) c. The average time a machine is out of service is hours. (Enter your response rounded to two decimal places.)