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

### Instruction:
Kelly, Brittany, and Buffy went swimming at Salt Rock Lake and held a contest to see who could hold their breath underwater for the longest amount of time.  Kelly held her breath underwater for 3 minutes.  Brittany held her breath underwater for 20 seconds less time than than Kelly did, and Buffy held her breath underwater for 40 seconds less time than Brittany did.  How long, in seconds, did Buffy hold her breath underwater?

### Response:
 Kelly alishikilia pumzi kwa dakika 3, au 3*60=<<3*60=180>>180 sekunde.
Brittany alishikilia pumzi kwa muda wa sekunde 20 chini ya Kelly, au 180-20=<<180-20=160>>160 sekunde.
Na Buffy alishikilia pumzi kwa muda wa sekunde 40 chini ya Brittany, kwa jumla ya 160-40=<<160-40=120>>120 sekunde.