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

### Instruction:
Emery and Serena go to their school library, and each borrows a copy of The life of Jack Steve's book to read for their school project. If Emery can read five times as fast as Serena, and the book takes her 20 days to read, what's the average number of days the two take to read the book?

### Response:
 Ikiwa Emery alitumia siku ishirini kusoma kitabu, basi Serena alitumia siku 5*20 = <<5*20=100>>100 kusoma kitabu.
Jumla ya siku zilizochukuliwa na wawili hao kusoma kitabu ni 100+20 = <<100+20=120>>120 siku.
Wastani wa siku wawili hao wanachukua kusoma kitabu ni 120/2 = <<120/2=60>>60 siku.