Water is dripping out from a conical funnel at a uniform rate of `4c m^3//c m` through a tiny hole at the vertex in the bottom. When the slant height of the water is 3cm, find the rate of decrease of the slant height of the water-cone. Given that the vertical angle of the funnel is `120^0dot`

Explanation

To solve the problem step by step, we will first understand the relationship between the volume of the cone, the dimensions of the cone, and how they change over time.

### Step 1: Understand the Geometry of the Cone
Given that the vertical angle of the funnel is \(120^\circ\), the angle at the vertex of the cone is \(60^\circ\) (since the angle is split in half).

Let:
- \(l\) = slant height of the cone
- \(h\) = height of the cone
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