A Crew of Mechanics at the Department of Transportation Garage

Multiple Choice

A crew of mechanics at the Department of Transportation garage make minor repairs to snowplows during the winter. The snowplows break down at an average rate of 4 vehicles per day and breakdowns are distributed according to the Poisson distribution. The mechanic can service an average of 7 vehicles per day with a repair time distribution that approximates a negative exponential distribution. Assume an 8 hour day.
-On average, how long does a plow wait before the mechanic begins the repair?

A) 0.19 hour
B) 1.25 hours
C) 1.52 hours
D) 2.64 hours