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A T.V. Tower stands vertically on a ba...

A T.V. Tower stands vertically on a bank of a river. From a point on the other bank directly opposite to the tower, the angle of elevation of the top of the tower is 60 degrees. From a point 20m away this point on the same bank, the angle of elevation of the top of the tower is `30o` . Find the height of the tower and the width of the river.

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