3) Two containers are connected to each other by a pipe with a diameter of 3 cm. Container A initially contains water but container B is empty. The cross-sectional area of container A and B are respectively 4 and 8 m2. If the energy head loss of the pipeline is hL, determine an equation for the time needed to empty the container A completely. Your proposed equation should be in terms of container A surface area, pipe cross sectional area, Ap, and hL.