Question: The ACS Trucking Company has a warehouse with three docks. Each dock can handle 2 trucks per hour. Trucks arrive at a rate of 5/hour and take a number from the dispatcher. When a dock becomes open, the truck with the lowest number enters the vacant dock.

a. Compute L, Lq, W and Wq

b. For an investment of $20,000, management can increase the service rate of each of the docks to 2.667 trucks/hour from the present capacity of 2/hour. Profit is increased $750/yr for each minute that waiting time (in the queue) is reduced. Determine if the investment should be made.