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I observe that the angle of elevation of the top of a tower is 30°. If I move 40m towards the tower, the angle of elevation of the top of the tower increases by 15°. Then what is my distance from the foot of the tower?

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I observe that the angle of elevation of the top of a tower is 30°. If I move 40m towards the tower, the angle of elevation of the top of the tower increases by 15°. Then what is my distance from the foot of the tower?






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