1.

An aeroplane flying at a height of 9000 m vertically above from the ground, passes another aeroplane when the angles of elevation of the two aeroplanes from a point on the ground are 60∘ and 30∘ respectively. Then the vertical distance between the aeroplanes at that instant is

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An aeroplane flying at a height of 9000 m vertically above from the ground, passes another aeroplane when the angles of elevation of the two aeroplanes from a point on the ground are 60 and 30 respectively. Then the vertical distance between the aeroplanes at that instant is



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