Atriangle has the perimeter of 31". the longest side is 1" less than twice the shortest side and the 3rd side is 4" longer than the shortest site. find the lengths of the sides

Andy wants to find the distance d across a river. he located points as shown in the figure, then use similar triangles to find that d = 223.5 feet. how can you tell without calculating that he must be wrong? tell what you think he did wrong and correct his error. round your answer to the nearest tenth if necessary. andy must have used the wrong . the distance d is actually feet.