A bird is sitting on a tree. A girl observes the bird at an angle of elevation of 30. When she moves 50 m towards the tree, she observes the bird at an angle of elevation 60. How far is she now from the base of the tree.
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a man on the top of a vestical tower obverse a car moving at a uniform speed coming distance towards it of it takes 12 minutes for tha angle of dipretion to chang for 30 ^ to 45 ^how long will the car take to seach tha observetion tower from this point
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