An automatic car wash consists of 3 processes: washing, rinsing and drying. The The first two processes are composed of 1 machine for each process, while for the drying are 3 people who do this work. On average, a car arrives every 10 minutes. For the washing process it takes an average time of 5 minutes, while for the rinsed it takes 4 minutes. Each person in the drying section can serve up to 3 cars per hour. a) What is the percentage utilization of each station?

b)On average, how long does it take for a car to be completely washed?

c) Could only 2 people be used for drying to reduce costs?