Question

a new system of production during the second industrial revolution meant that unskilled workers did different tasks all day, repetitive tasks for only a few hours, one complicated task for many hours, repetitive tasks for many hours

Explanation:

During the Second - Industrial Revolution, the new production system like the assembly - line required unskilled workers to perform repetitive tasks for long hours. This was due to the division of labor which made work simple and repetitive.

Answer:

repetitive tasks for many hours