any help appreciated

Question 2: The table below defines the precedence relationships and element times for a new assembled product. a) Construct the precedence diagram for this job. b) If the ideal cycle time is 1.1 min and the repositioning time is 0.1 min, what is the theoretical minimum number of workstations required to minimise the balance delay under the assumption that there will be one worker per station? c) Using "longest task time" rule, assign work elements to stations. d) Compute the balance delay for your solution. Work T. (min) Immediate Work T. Immediate element predecessors element (min) predecessors 1 0.5 6 0.6 3 2 0.3 7 0.4 4,5 3 0.8 1 8 0.5 3,5 4 0.2 2 9 0.3 7,8 5 0.1 2 10 0.6 6,9 20 marks