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 solve the problem step by step, we will follow the logical flow of the question and calculations as described in the video transcript.

### Step-by-Step Solution:

**Step 1: Understand the dimensions of the plot and the drain.**
- The dimensions of the rectangular plot are given as 240 m by 180 m.
- A drain that is 10 m wide is dug around the plot.

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