JAVA QUESTION

A worker packs boxes that arrive at a rate of one every 15(+-3) minutes. It takes 10 (+- 3) minutes to pack a box. Once every hour, the worker is interrupted to wrap specialty orders that take 16 (+- 3) minutes to pack. Upon completing the specialty order, the worker then completes the interrupted order. Simulate for 40 hours. Estimate the mean proportion of time that the number of boxes waiting to be packed is more than five and the average number of boxes waiting to be packed