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There is a small island in the middle...

There is a small island in the middle of a 100m wide river and a tall tree stands on the island. `P` and `Q` are points directly opposite to each other on two banks and in line with the tree. If the angles of elevation of the top of the tree from `P` and `Q` are respectively `30o` and `45o` , find the height of the tree.

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