A boat heading out to sea starts out at Point A, at a horizontal distance of 867 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 15º. At some later
time, the crew measures the angle of elevation from point B to be 5º. Find the
distance from point A to point B. Round your answer to the nearest tenth of a foot if
necessary.