Aerospace Ventures has forecast orders for its new two engine turboprop passenger plane at the rate of $380$ aircraft per year. It is currently in the process of planning its production line, which will consist of several aircraft assembly teams that carry out the tasks assigned to them $($this is similar to workstations, except that the aircraft do not move from station to station$).$ The tasks and related times $($in hours$)$ and precedence relationships are given in the table below. The company would like to know the number of assembly teams required and what tasks they carry out so that it can plan the process.