Angle of elevation/minutes +seconds/triangles.... (trig problem!)?

Devvvvvvvy

New member
A flagpole 40 feet high stands on top of the WEntworth Building. From a point in front of Bailey's Drugstore, the angle of elevation for the top of the pole is 54 degrees 54 minutes, and the angle of elevation for the bottom of the pole is 47 degrees 30 minutes. How high is the building?


I'm completely stuck. Please explain!
 
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