A plot of land in the form of rectangle has a dimension 240m 180m A drainlet 10m wide - Maths - Surface Areas and Volumes of Solids

Question

A plot of land in the form of rectangle has a dimension 240m?180m A
drainlet 10m wide is dug all around it (on the outside) and the
earth dug out is evently spread over the plot , increasing its
surface lavel by 25cm Find the depth of the drainlet

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A plot of land in the form of rectangle has a dimension 240m?180m . A drainlet 10m wide is dug all around it (on the outside) and the earth dug out is evently spread over the plot , increasing its surface lavel by 25cm. Find the depth of the drainlet.