a property owner wants to build a small bridge across a stream running through his field. He knows that the weight the bridge can support is inversely proportional to the length of the bridge. If he builds the bridge across the widest part of the stream, which is 4 feet in length, the bridge can hold 120 pounds of weight. How much weight can the bridge support if he builds it across the part of the stream that is 2.5 feet in length