An angler hooks a trout and reels in his line a 3 in./s. Assume the tip of the fishing rod is 11 ft above the water and directly above the angler, and the fish is pulled horizontally directly toward the angler (see figure). Find the horizontal speed of the fish when it is 16 ft from the angler. a.) When the fish is 16 ft from the angler, its horizontal speed it about _