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Walls of two buildings on either side of...

Walls of two buildings on either side of a street are parallel to each other. A ladder 5.8m long is placed on the street such that its top just reaches the window of a building at the height of 4m. On turning the ladder over to the other side of the street, its top touches the window of the other building at a height 4.2m. Find the width of the street.

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The correct Answer is:
8.2 metre.
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