The orange shelf was 5'6. First, let's put that into inches. There are 12 inches in one foot, and 5 feet. 12x5= 60. 60+6=66 inches. We then Multiply that by 2. 66x2= 132. The brown shelf is 132 inches long. We then put that back into feet. 132/12= 11. The brown shelf is 11 feet long.