Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
A group of security guards were hired for the night shift at a factory. The four guards agreed to a rotating schedule to cover the nine hours of the night shift. The first guard would take three hours since they were still awake, the last guard would wake up early and take two hours, and the middle two guards would split the remaining hours. How many hours will each middle guard take?

### Response:
 Kwa kuwa kuna walinzi wanne, kila mmoja atafanya kazi masaa 9 / 4 = <<9/4=2.25>>2.25.
Mlinzi wa kwanza na wa mwisho watachukua masaa 3 + 2 = <<3+2=5>>5 ya zamu ya usiku.
Hii inamaanisha walinzi wawili wa kati watafunika masaa 9 - 5 = <<9-5=4>>4.
Kila mlinzi wa kati atachukua masaa 4 / 2 = <<4/2=2>>2.