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A TV tower stands vertically on a bank o...

A TV tower stands vertically on a bank of a canal. From a point on the other bank directly opposite the tower, the angle of elevation of the top of the tower is `60^@`. From a point 20maway from this point on the same bank, the angle of elevation of the top of the tower is `30^@` (see fig.). Find the height of the tower and the width of the canal.

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