- #1

- 3

- 0

## Homework Statement

A water tank has the shape of an inverted right-circular cone, with radius at the top 15 meters and depth 12 meters. Water is flowing into the tank at rate of 2 cublic meters per minute. How fast is the depth of water in the tank increasing at the instant when the depth is 8 meters

## Homework Equations

V=(1/3)(pi)(r^2)(h)

## The Attempt at a Solution

dv/dt=2 meter^3/min

dv/dt=(1/3)(pi)(2rh(dr/dt)+(r^2)(dh/dt))

but that has 2 unknow varibles in it.