Kay's Window Company has a variable demand. Historically, its demand has ranged from 20 to 40 windows per day with an average of 30. Kay Ballard works eight hours a day, five days a week. Each order is one window and each window takes 13 minutes.

What's the average waiting time in minutes?

Kay plans to add doors to its product line and anticipates that they will average 5 doors per day. Each door takes 12 minutes to install

whats the avrg waiting time, in min, if Kay continues to be the only worker