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A plot of land in the form of a recta...

A plot of land in the form of a rectangle has a dimension `240 m\ x\ 180 m` . A drainlet `10 m` wide is dug all around it (on the outside) and the earth dug out is evenly spread over the plot, increasing its surface level by `25\ c mdot` Find the depth of the drainlet.

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The correct Answer is:
1.227m
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