Problem
During some off-peak hours, orders arrive at the rate of 3 orders/hour. Suppose that there are only 2 in-store shoppers. Assume the same time estimates and number of shoppers as in the previous question. That is, it takes 25 minutes for a shopper to pick all items on the list, and 15 minutes to check out the items and move them to the staging area. For simplicity, we may consider all time durations (including the operational times mentioned above and the interarrival times of orders) are deterministic (i.e., they are constants without any variability). Develop a Gantt chart to visualize the process.