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

`alpha=frac{120^{circ}}{2}=60^{circ}`



`because frac{{r}}{{h}}=tan alpha`



`Rightarrow {r}=tan 60^{circ} times {h}`





...