1. The problem statement, all variables and given/known data An inverted right circular cone of vertical angle 120 is collecting water from a tap at a steady rate of 18∏ cm^3/min. Find a) the depth of water after 12min, b) rate of increase of depth at this instant 2. Relevant equations 3. The attempt at a solution All I know is that dV/dt = 18cm3/min so shouldn't the depth after 12 mins be 12 * dv/dt?