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**Tebby** A student organization is planning a car wash. A shopping center has granted

permission to use a portion of its parking lot with the understanding that no more than 24 meters of

driveway length will be used. The students expect the 8 meter-long cars to arrive at the car wash one

every 10 minutes on the average, and the car-washing team believes that it can wash a car in 5 minutes

on the average.

a). What proportion of the time will the students be able to rest?

b). How many cars will be waiting in line at the car wash on the average?