A crew of mechanics at the Highway Department garage repair vehicles that break down at an average o

A crew of mechanics at the Highway Department garage repair vehicles that break down at an average of 9.5 vehicles per day (randomly). The mechanic crew can service an average of 13 vehicles per day with a repair time distribution that approximates an exponential distribution. What is the average time (in days) before the facility can return a breakdown to service from vehicle arrival until service complete?