<human>:  Carrie is planning the caroling schedule. The choir plans to sing "Deck the Halls" twice and "Jingle Bells" once. If "Deck the Halls" is 150 seconds long and "Jingle Bells" is 240 seconds long, how long will they be caroling?
<bot>: How long is "Deck the Halls"? ** First find the total time the choir spends singing "Deck the Halls": 2 * 150 seconds = <<2*150=300>>300 seconds
How long will they be caroling? ** Then add that time to the time spent singing "Jingle Bells": 300 seconds + 240 seconds = <<300+240=540>>540 seconds
#### 540