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

### Instruction:
 Emery na Serena wanakwenda katika maktaba ya shule yao, na kila mmoja anakopa nakala ya kitabu cha Maisha ya Jack Steve kusoma kwa mradi wao wa shule. Ikiwa Emery anaweza kusoma mara tano kwa haraka kuliko Serena, na kitabu kinamchukua siku 20 kusoma, ni wastani wa siku ngapi wawili hao wanachukua kusoma kitabu hicho?


### 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.