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     EduGorilla 
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    A bird sitting on the top of a tree, which is 100 m high. The angle of elevation of the bird, from a point on the ground is 45° towards north. The bird flies away from the point of observation horizontally and remains at the same height. After 20 seconds, the angle of elevation of the bird from the point of observation becomes 30° towards south. Find the speed of the bird in meter per second.

    Options :-

    1. 5

    2. 5(1+√3)
    3. 5(3+√1)

    4. None of these

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