I have this problem. It states:" The pilot of a ship it follows a bearing 290. Then, he sees in an instant given that it is aligned with two lighthouses. They are to the N8 20' E in relation to the ship. Both lighthouses are far apart 1.8Km. Ten minutes later, the pilot watches that the houselights form an angle of 15 10' and one of them, that is further north, it has an azimuth of 50, that is it is towards N50 E. Find the velocity of the ship. I will thanked by any hint to solve this problem.