Question

A plane is flying a course directly over a straight line joining two observation posts which...

A plane is flying a course directly over a straight line joining two observation posts which are on level ground below the plane, and which are 1 mile apart. The plane is observed simultaneously at each post. One post finds the angle of elevation to be 61° and the other finds it to be 55°. Find, to the nearest hundred feet, the height at which the plane is flying.

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