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

### Instruction:
 Emma alisafiri kwa gari maili 280 kwa saa 2 na dakika 20. Kasi wastani ya gari ilikuwa maili ngapi kwa saa?


### Response:
 Tunabadilisha muda wa saa 4 na dakika 20 kuwa dakika 2 saa 20 dakika = 2 × 60 + 20 = 140 dakika.
Tunahesabu kasi wastani S: umbali / muda. Hivyo, S = maili 280 / dakika 140 = <<280/140=2>>2 maili / dakika.
Hivyo, kasi ni 2 maili / dakika * 60 dakika/saa = <<2*60=120>>120 maili/saa.