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

### Instruction:
Polly and Peter play chess. Polly takes an average of 28 seconds per move, while Peter takes an average of 40 seconds per move. The match ends after 30 moves. How many minutes did the match last?

### Response:
 Polly na Peter wote wawili walicheza hatua 30 / 2 = <<30/2=15>>15 kila mmoja.
Kwa wastani wa sekunde 28 kwa kila hatua, hatua za Polly zilidumu jumla ya sekunde 15 * 28 = <<15*28=420>>420.
Kwa wastani wa sekunde 40 kwa kila hatua, hatua za Peter zilidumu jumla ya sekunde 40 * 15 = <<40*15=600>>600.
Jumla ya mchezo ulidumu sekunde 420 + 600 = <<420+600=1020>>1020.
Ukigeuza kuwa dakika, mchezo ulidumu dakika 1020 / 60 = <<1020/60=17>>17.