Refer to Exercise 11-10. Each component has a time to failure that is exponentially distributed, with a mean time to failure of 3000 hours. Find the reliability of the subassembly for 2500 hours of operation. What is the mean time to failure of the subassembly? If it is desired that the subassembly has a mean time to failure of 6600 hours, what would have to be the mean time to failure of the components?