1.

An aeroplane flying horizontally 1 km above the ground is observed at an elevation of 60∘ and after 10 seconds the elevation is observed to be 30∘. The uniform speed of the aeroplane in km/h is

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An aeroplane flying horizontally 1 km above the ground is observed at an elevation of 60 and after 10 seconds the elevation is observed to be 30. The uniform speed of the aeroplane in km/h is



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