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An aeroplane flying at a constant speed, parallel to the horizontal ground, $$\sqrt 3 $$ kmabove it, is obsered at an elevation of $${60^o}$$ from a point on the ground. If, after five seconds, its elevation from the same point, is $${30^o}$$, then the speed (in km / hr) of the aeroplane, is :

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Let a vertical tower AB have its end A on the level ground. Let C be the mid-point of AB and P be a point
on the ground such that AP = 2AB. If $$\angle $$BPC = $$\beta $$, then tan$$\beta $$ is equal to:

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The angle of elevation of the top of a vertical tower from a point A, due east of it is 45

^{o}. The angle of elevation of the top of the same tower from a point B, due south of A is 30^{o}. If the distance between A and B is $$54\sqrt 2 \,m,$$ then the height of the tower (in metres), is :4

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A man is walking towards a vertical pillar in a straight path, at a uniform speed. At a certain point A on the path, he observes that the angle of elevation of the top of the pillar is 30

^{o}. After walking for 10 minutes from A in the same direction, at a point B, he observes that the angle of elevation of the top of the pillar is 60^{o}. Then the time taken (in minutes) by him, from B to reach the pillar, is :Questions Asked from Height and Distance (MCQ (Single Correct Answer))

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