Help me understand this trig question please?

The Gibbs Hill lighthouse stands 117 feet high on a hill 245 feet high so its beam of light is 362 feet above sea level. A brochure states that ships 40 miles away can see the light and planes flying at 10, 000 feet can see it 120 miles away. Verify the accuracy of these statements. What umption did the vrochure make about the height of the ship?