



 
Hi Natalie, I think that the problem should say "The same ship spots a jet at N62E travelling at an altitude of 1500m with an angle of elevation of 15 degrees." That is the plane is 62 degrees east of north as viewed from the ship. Here is a two dimensional diagram on the surface of the Earth. The ship is at S, the lighthouse at L and the airplane at A. Since you know the height of the lighthouse and the angle of elevation you can use the tangent function to find the length SL. Similarly you can find the length SA. Now use the law of cosines on the triangle LSA to find AL. I hope this helps,  


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