Use a takt time of 120 seconds and follow the most

Question

Question: Read the question and give answer using given table:

Task                       Predecessor                       Average Time (sec)

A                             none                                     40

B                             none                                     60

C                             B                                          30

D                             C                                          30

E                            A, D                                        30

F                             E                                           30

a) Use a takt time of 120 seconds and follow the "most following tasks" heuristic rule to assign these tasks to the work stations. Show which tasks are assigned to each workstation.

b) Compute the efficiency and percent idle time for the system.