Aflexible manufacturing system has four workstations. it uses a rail guided vehicle system to move parts between stations in the layout. all workparts are loaded into the system at station 1, moved to one of three processing stations (2, 3, or 4), and then brought back to station 1 for unloading. load and unload times at station 1 are each 1.5 min. processing times at other stations are: 6.0 min at station 2, 8.0 min at station 3, and 7.0 min at station 4. hourly production of parts through the system is: 8 parts through station 2, 5 parts through station 3, and 7 parts through station 4. the system has the following from-to chart: