Cory takes 22 + 3 = <<22+3=25>>25 minutes to clean her room.
Blake takes 25 - 4 = <<25-4=21>>21 minutes to clean his room.
The three of them can clean their room in 22 + 25 + 21 = <<22+25+21=68>>68 minutes in all.
In a week, they spend 68 x 2 = <<68*2=136>>136 minutes cleaning their rooms.
#### 136