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

### Instruction:
 Baadhi ya marafiki walikwenda kwenye safari ya kutembea kwa masaa 3.5. Walisafiri umbali wa kilomita 21 katika kipindi hicho. Birgit alikuwa haraka kwa dakika 4/km kuliko wastani wa wakati. Ikiwa Birgit atabaki na kasi ile ile, itamchukua dakika ngapi kwenda kilomita 8?


### Response:
 Dakika zilizotumika kutembea = 3.5*60 = <<3.5*60=210>>210 dakika
Kasi ya wastani = 210 dakika / 21 km = 10 dakika/km
Birgit ni haraka kwa dakika 4/km = 10 dakika/km - 4 dakika/km = 6 dakika/km
Itamchukua dakika 6*8 = <<6*8=48>>48 kwenda kilomita 8
Birgit atachukua dakika 48 kusafiri kilomita 8.