Throughout the 30 minutes, Kris blows up 2 balloons per minute * 30 minutes = <<2*30=60>>60 balloons.
Her brother works at double Kris' speed in the first 15 minutes so he works at 2 balloons per minute * 2 = <<2*2=4>>4 balloons per minute.
So in the first 15 minutes, he blows up 4 balloons per minute * 15 minutes = <<4*15=60>>60 balloons.
In the second 15 minutes, he is working at double the rate he did previously, so he blows up 4 balloons per minute * 2 = <<4*2=8>>8 balloons per minute.
In the second 15 minutes, Kris’ brother therefore blows up 8 balloons per minute * 15 minutes = <<8*15=120>>120 balloons.
Throughout the 30 minutes, he has blown up a total of 60 + 120 = <<60+120=180>>180 balloons.
Kris and her brother therefore blew up a total of 60 balloons from Kris + 180 balloons from Kris’ brother = <<60+180=240>>240 balloons.
#### 240