Since Peter reads three times as fast as Kristin, Kristin will take 18*3 = <<18*3=54>>54 hours to read one book.
Kristin reads half of her books, a total of 20/2 = <<20/2=10>>10 books.
The time Kristin will take to read half of her books is 10*54 = <<10*54=540>>540
#### 540