A pilot is flying over a straight highway. He determines the angles of depression to two mileposts, apart, to be and Invalid variable, as shown in the figure.

NOTE: The picture is NOT drawn to scale.

What is the elevation of the plane in ? Give your answer to the nearest whole number.
height =

Get help: Worked Example 1

Box 1: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity