1. ) Find the orthogonal trajectories of the family of curves: 92 = Kx3. 1) 2) A tank contains 100L of beer with 5% alchohol. Beer with 7% alchohol is pumped into 2) the tank at a rate of 1L/ min. The fluid in the tank is kept thoroughly mixed and drains from the tank at a rate of 1 L/min. What is the alchohol percentage of beer in the tank after 1 hour