during the campus spring fling, the bumper car amusement attraction has a problem with cars becoming disabled and in need or repair. repair personnel can be hired at the rate of $22 per hour. One repairer can fix cars in an average time of 25 minutes. while a care is out of service disabled the waiting to be repaired or being repaired, lost income is $42 per hours. cars tend to break down at the rate of two per hour. Assume that their is only one repair person, the arrival rate follows a Poisson distribution and the service time follows an exponential distribution.

A. On Average how long is a disabled bumper car out of service waiting to be repaired?