Build a model of a two-station assembly line serving three types of parts. The sequence of part types is random. The part types are distributed as follows: part type 1, 30%; part type 2; 50%, and part 3, 20%.
Inter-arrival time is a constant 5 minutes. The first station requires a setup task of 1.5 minutes duration whenever the current part type is different from the preceding one. The operation times are the same regardless of part type: station 1, 3 minutes and station 2, 4 minutes.