The pilot of an aeroplane, flying 10km above the ground in the direction of a landmark, views the landmark to have angles of depression of 35^o and 55^o. Find the distance between the two points of observation

• A.10(sin 35^o - sin 55^o)
• B.10 cos35^o - cos 55^o
• C.10(tan35^o - tan55^o)
• D.10(cot35^o - cot55^o)
• E.