Chapter 7.4: a. D = 50 pieces/hour T = 30 minutes = 0.5 hours C = 10 pieces per container DT 50 pieces/hou r 0.5 hours 2.5 kanbans and containers 3 kanbans and containers C 10 pieces/container (Each kanbans, or card, must be a whole unit; and each container needs to hold the same number of pieces.) N b. As the system improves, the cycle time (T) should be decreased. If T is reduced, then N is reduced (per the formula); so the plant will need fewer containers.