The tallest inhibited building in the world is the Eiffel Tower in Paris. If the observation tower is 30963 m above ground level, how far can a person standing in the observation tower see ( using a telescope ) ? Use 3960 miles for the radius of Earth.
See Shuk's Diagram ( the figure below ).
[ 1 miles = 1609.34 metre ]
Your answer should be in the unit of metre ( m )