A plot of land in the form of a rectangle has a dimension `240 m xx 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.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Calculate the area of the plot of land.
The area of a rectangle is given by the formula:
\[ \text{Area} = \text{length} \times \text{width} \]
Given dimensions are:
- Length = 240 m
- Width = 180 m
...