what is the direct labor content? is it 270 the sum of all seconds involved in all the tasks or not ?

Consider the following tasks that must be assigned to four workers on a conveyor-paced assembly line (i.e., a machine-paced line flow). Each worker must perform at least one task. There exists unlimited demand unless stated otherwise. Time to Complete Task (seconds): - Task 1:30 - Task 2:25 - Task 3:15 - Task 4:20 - Task 5:15 - Task 6:20 - Task 7:50 - Task 8:15 - Task 9:20 - Task 10:25 - Task 11:15 - Task 12:20 The current conveyor-paced assembly-line configuration assigns the workers in the following way: - Worker 1: Tasks 1, 2,3 - Worker 2: Tasks 4,5,6 - Worker 3: Tasks 7, 8,9 - Worker 4: Tasks 10,11,12 What is the direct labor content (in seconds per unit)