A plot of land in the form of a rectangle has a dimension `240m xx 180m`. A drain 10m 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 25cm. Find the depth of the drain let.

Explanation

To find the depth of the drain dug around the plot of land, we can follow these steps:

### Step 1: Calculate the area of the plot of land.
The area of a rectangle is given by the formula:
\[ \text{Area} = \text{length} \times \text{width} \]
Here, the length is 240 m and the width is 180 m.
...