A boat heading out to sea starts out at point a, at a horizontal distance of 1285 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 13 degrees . at some later time, the crew measures the angle of elevation from point b to be . find the 5 degrees distance from point a to point b. round your answer to the nearest tenth of a foot if necessary .