To answer this item, we first determine the volume of the inverted cone thru the equation,
                    V = Bh/3
where B is the area of the base and h is the height.Â
                  V = (π)(3 in)²(4 in) / 3
                    V = 37.68 in³
Then, divide the rate of the water dripping by the number of house,
                        n = (37.68 in³)/12 in³/min
                          n = 3.14 mins