Incomplete question. I answered from a general economic standpoint.
Answer:
stay the same; decrease
Step-by-step explanation:
Remember, in this scenario, it wasn't as though the mentioned workers lost their jobs, they only had their hours reduced by their employers; so they are not unemployed. This, therefore, implies that the unemployment rate will stay the same.
The labor force participation rate in simple words refers to the percentage of those who are currently employed or looking for a job within an economy. If the working hours are reduced, it may diminish the zeal among the workforce of an economy to work or find work because they may perceive they''ll earn less.