Need help understanding how to do this.

7. Consider the following six tasks that must be assigned to 4 workers on an assembly line. Each worker must perform at least one task. Time to comblete task The current assembly line configuration assigns the workers in the following way: 2 Worker1:Worker2:Worker3:Worker4:Task1Task2Task3,4Task5,6 a) What is the capacity of the current line? b) Now reallocate these tasks to the same four workers to increase the capacity of the whole line, subject to the conditions that (1) a worker can only perform two adjacent operations and (2) all tasks need to be done in their numerical order. What is the capacity of this line now