Frank James Works for a Production Facility That Makes Car

Short Answer

Frank James works for a production facility that makes car radios. His job is to insert the integrated circuits and make sure that they work correctly. He is expected to handle 20 radios per hour. The factory uses a Kanban production system with containers that hold four radios. It takes 60 minutes for Frank to receive the radios from the previous work station. How many Kanbans are needed?