please solve all 6 parts

Question #1 You are the manager of a construction company. You need to determine the system parameters related to the operation of your cement trucks. It takes a constant time of 7 minutes to fill a cement truck with cement. Once filled the truck goes to the assigned construction site to unload. Trucks arrive at a rate of 6 per hour following a Poisson distribution. Determine each of the following... (12 Marks) 1. average # units/people in the system. 2. average time spent in the system. 3. length of the line 4. average time spent in queue. 5. Utilization 6. probability of zero units in the system