A fleet of infinity trucks supplies a small lumberyard. One overhead crane is available to unload the long logs from the trucks. It takes an average of 1 hour to unload a truck. After unloading, a truck takes an average of 3 hours to get the next load of logs and return to the lumberyard. What is the average number of trucks waiting in the queue to be unloaded? What is the probability that crane is busy? What is the long-run utilization of the crane? Calculate all the above performance measures for a case when there are two cranes available.