<human>:  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?
<bot>: How long did Kelly hold her breath underwater? ** Kelly held her breath for 3 minutes, or 3*60=<<3*60=180>>180 seconds.
How long did Brittany hold her breath underwater? ** Brittany held her breath for 20 seconds less time than Kelly did, or 180-20=<<180-20=160>>160 seconds
How long did Buffy hold her breath underwater? ** And Buffy held her breath for 40 seconds less time than Brittany did, or for 160-40=<<160-40=120>>120 seconds.
#### 120