A person observes the angle of elevation...

A person observes the angle of elevation of a building as `30^@`. The person proceeds towards the building with a speed of `25(sqrt3-1) m//h`. After two hours, he oberves the angle of elevation as `45^@`. The height of the building (in m) is :

`50(sqrt3-1)`

`50(sqrt3+1)`

100

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