<human>:  At school today, Charlize was 20 minutes late. Four of her classmates were each ten minutes late than she was. What's the total time for which the five students were late?
<bot>: How many minutes late were each of her friends? ** If Charlize was 20 minutes late, each of her friends was 20+10 = <<20+10=30>>30 minutes late.
How many minutes were each of her friends late? ** The total time for which Charlize's friends were late was 4*30= <<4*30=120>>120 minutes.
How many minutes were the three friends late? ** Together with Charlize, the three friends were 120+20 = <<120+20=140>>140 minutes late.
#### 140