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a) An order for 100 of a product is processed on work centers A and B. The setup time on A is 30 minutes, and run time is ten minutes per piece. The setup time on B is 50 minutes, and the run time is five minutes per piece. Wait time between the two operations is four hours. The move time between A and B is ten minutes. Wait time after operation B is four hours, and the move time into stores is 15 minutes. There is no queue at either workstation. Calculate the total manufacturing lead time for the order.
(b) It is decided to overlap operations A and B by splitting the lot of 100 into two lots of 70 and 30. Wait time between A and B and between B and stores is eliminated. The move times remain the same. Setup on operation B cannot start until the first batch arrives. (a) Calculate the manufacturing lead time. (b) How much time has been saved? Please refer to lecture 3 “Lean-terms.”