An industrial tank is cylindrical. It holds a chemical (S.G. = 1.1). The tank's diameter is 10 m and its height is 1 m. It is initially half full. At this time, the tank starts drain- ing at an average of 100 gal/min. Five minutes later, fluid starts entering at 150 kg/s. Is the tank emptying or filling when it is both filling and emptying? Find the time that it either empties or overflows.