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

### Instruction:
Mary's sheep can run 12 feet per second, and her sheepdog can run 20 feet per second. A sheep standing 160 feet away from the sheep dog bolts, and the dog runs after it. How many seconds does it take the dog to catch the sheep?

### Response:
 Kwanza tafuta kasi ya mbwa ni kiasi gani zaidi ya kondoo: futi 20/sekunde - futi 12/sekunde = <<20-12=8>>8 futi/sekunde
Kisha gawanya umbali ambao mbwa anakimbia kwa tofauti ya kasi: futi 160 / futi 8/sekunde = 20 sekunde