Motivated by "Terminator Salvation", a toy company plans to produce little toy terminators. Heads and torsos will be assembled separately, but in parallel, and then the head will be attached to the body before the product will be packaged. In the following the detailed steps are described: The head goes in sequence through the following three stations: add eyes (together 10 secs), add chip (10 secs), and add voice module (10 secs). At the same time as the head finishing, the torso goes in sequence through the three stations: add legs (together 5 secs), add batteries (15 secs), and add arms (together 5 secs). Then the finished head will be attached to the finished body (10 secs) and the toy will be packaged (5 secs).

1. Assuming the production has been started up in the morning and is running smoothly now. What is the time between two finished toy terminators?
2. Draw a Gantt chart for the production of the first three toy terminators in the morning. Use different colors/patterns or numbers (1,2,3) to distinguish the bars for the three different toy terminators
3. What is the utilization of the packing station?
4. What is the average utilization of all stations?