If they put a yardstick up and Ravenclaw's tower is the same height, because Gryffindor was trying to beat them, a yard stick isn't 1 foot. Meaning the Gryffindor tower is 3 feet or a yard taller than Ravenclaw's tower.
I have a Gryffindor, Ravenclaw AND Hufflepuff for friends, I'm a Slytherin. And I couldn't agree with this more. Only the Ravenclaw tends to analyze every little bit of the movie. I am a Slytherin but I laugh at horror movies