<human>:  Polly and Peter play chess. Polly takes an average of 28 seconds per move, while Peter takes an average of 40 seconds per move. The match ends after 30 moves. How many minutes did the match last?
<bot>: How many moves did Polly and Peter play? ** Both Polly and Peter played 30 / 2 =<<30/2=15>>15 moves each one
How many seconds did Polly's moves last? ** With an average of 28 seconds per move, Polly's moves lasted a total of 15 * 28 = <<15*28=420>>420 seconds.
How many seconds did Peter's moves last? ** With an average of 40 seconds per move, Peter's moves lasted a total of 15*40=<<15*40=600>>600 seconds.
How many seconds did the match last? ** In total, the match lasted 420 + 600 = <<420+600=1020>>1020 seconds.
How many minutes did the match last? ** In minutes, the match lasted 1020 / 60 = <<1020/60=17>>17 minutes
#### 17