Let us suppose a single product requires a three step process:
Stage 1: It takes 25 minutes at this step, there are 10 machines, the machines are 80% available, and the product faces 90% yield.
Stage 2: It takes 15 minutes at this step, there are 6 machines, the machines are available 90% available, and the product faces 95% yield.
Stage 3: It takes 12 minutes at this step, there are 4 machines, the machines are available 75%, and the product faces an 80% yield.
How many units can this system produce per hour?