A boat heading out to sea starts out at Point A, at a horizontal
distance of 724 feet from a lighthouse/the shore. From that
point, the boat's crew measures the angle of elevation to the
lighthouse's beacon-light from that point to be 16°. At some
later time, the crew measures the angle of elevation from
point B to be 5°. Find the distance from point A to point B.
Round your answer to the nearest foot if necessary.