An aeroplane flying with uniform speed horizontally one {\km} above the ground is observed at an elevation of 60^{\circ}. After 10 { s} if the elevation is observed to be 30^{\circ}, then the speed of the plane (in {\km} \/ {\h} ) is

EAMCET Engineering 2004 Solved Paper

Section: Mathematics

Question : 115 of 160

Marks: +1, -0

An aeroplane flying with uniform speed horizontally one km above the ground is observed at an elevation of 60∘. After 10 s if the elevation is observed to be 30∘, then the speed of the plane (in km∕h ) is

‌
240
√3
200√3
240√3
‌
120
√3

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