Please help me construct an activity on node network diagram for the above Gantt chart using the ES, EF, LS, LF, Act. name and duration notation.

Find the critical path and calculate time to completion. Please annotate these two items and please draw out how the diagram and critical path are supposed to look in graphic format, I am very confused on how it is supposed to look.

 

ACTIVITY A: Aircraft stops at PLAN PLAN START DURATION gate 0 0 B: Jet bridge connected 0 5 C: Passengers deplane 5 10 D: Baggage Offloaded 15 15 E: Refueling/water servicing 25 25 F: Galley servicing 40 20 G: Cabin cleaning 40 20 H: Baggage loaded 55 15 I: Passengers boarded 55 15 J: Aircraft ready for departure 70 85