Save The time t required to empty a wastewater-holding tank is inversely proportional to the cross-sectional area A of the drainage pipe. If it takes 2.0 h to empty a tank with a drainage pipe for which A = 46 in.2, how long will it take to empty the tank if A = 72 in.2? . . . It will take h to empty the tank if A = 72in.2 (Type your answer using the appropriate number of significan