She reads at 55 pages per hour for 4 hours so 55*4 = 220 pages so far. This means that she read 220 and had 330 left so 220 + 330 = 550 so the book is 550 pages. If she reads 55 pages per hour and there is a total of 550 pages, 550/55 = 10 hours to read the book.
The defenition of a rectangle is that it has 4 angles that measure 90 degrees ther are infinite legnths and inifinite numbers intinite side legnths so infinite number of unique rectangles
