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

### Instruction:
Billy and Margaret are competing with each other to see who can swim 10 laps the fastest. Billy swims his first 5 laps in 2 minutes, swims the next 3 laps in 4 minutes, swims the next lap in 1 minute, then swims his final lap. Margaret finishes swimming all of her laps in 10 minutes. Billy wins the competition by finishing his laps 30 seconds before Margaret does. In seconds, how long did it take Billy to swim his final lap?

### Response:
 Margaret alimaliza kuogelea mizunguko yake kwa sekunde 10 dakika * 60 sekunde = <<10*60=600>>600 sekunde.
Mizunguko ya kwanza 5 ya Billy ilichukua dakika 2 * 60 sekunde = <<2*60=120>>120 sekunde.
Mizunguko inayofuata 3 ilichukua dakika 4 * 60 sekunde = <<4*60=240>>240 sekunde.
Mzunguko wake wa tisa ulichukua dakika 1 * 60 sekunde = <<1*60=60>>60 sekunde.
Hivyo mizunguko yake ya kwanza 9 ilichukua 120 + 240 + 60 = <<120+240+60=420>>420 sekunde.
Billy alimaliza kuogelea mizunguko yake kabla ya Margaret, hivyo mizunguko yake yote ilichukua jumla ya 600 - 30 = <<600-30=570>>570 sekunde.
Hii inamaanisha kuwa ilichukua 570 sekunde kwa jumla ya muda wa kuogelea - 420 sekunde kwa muda uliotumika kuogelea mizunguko ya kwanza 9 = 150 sekunde kwa Billy kuogelea mzunguko wake wa mwisho.