A person walks towards a tower. Initially when he starts an angle of elevation of the top of the tower is 30 degree. On traveling 20 metres towards the tower, the angle changes to 60 degree. How much more he has to travel.

Kindly, refer to the below link for similar query,
https://www.meritnation.com/ask-answer/question/a-person-observed-the-angle-of-elevation-of-the-top-of-a/math/12144581
[Note: The value of 'x' will give the remaining distance he needs to travel]
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