It takes Aaron 15 minutes to produce 10 widgets to fill a container and 5 minutes to

Question:

It takes Aaron 15 minutes to produce 10 widgets to fill a container and 5 minutes to transport the container to the next station, where Maria works. Maria’s process takes about 30 minutes. The factory uses a safety factor of 20%. Currently, five kanbans rotate between Aaron and Maria’s stations. What is the approximate demand for widgets?