How do you solve what the third task is in work station 1 using 4 work stations?

As part of a major plant renovation project, the industrial engineering department has been asked to balance a revised assembly operation to achieve an output of 240 units per eighthour day. Task times and precedence relationships are as follows: e. Using 4 work stations, assign tasks to workstations on the basis of greatest number of following tasks. When there is a tie, assign the task with longest processing time first. What is the third task in work station 1