1. The problem statement, all variables and given/known data 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 2. Relevant equations V=(1/3)(pi)(r^2)(h) 3. 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.