Brain-Teaser 494

From The Sunday Times, 15th November 1970 [link]

Tina and Cindy each started with a rectangular sheet of cardboard. The two rectangles had equal dimensions.

Each girl cut her sheet into 5 squares using 4 straight cuts; the first 3 cuts producing one square each and the fourth cut producing two squares. The first square obtained by Tina had twice the area of the first square obtained by Cindy.

If Tina’s fifth square had an area of one square inch, what was the area of the rectangles?