So you have 6 faces on a square, correct? And then you have 5 faces on a pyramid (including bottom). S, in how I am seeing it, you divide 6 by 5 to get 1.2. If this is incorrect I am sorry but that is what I see is correct.
Let the integers be x and x+2 area of rectangle= length × breadth x × (x+2) = 120 x square + 2x =120 x square + x = 60 x + x = root of 60 x = root of 60 / 2