Atank contains 1000l of pure water. brine that contains 0.03kg of salt per liter enters the tank at a rate of 5l/min. also, brine that contains 0.08kg of salt per liter enters the tank at a rate of 10l/min. the solution is kept thoroughly mixed and drains from the tank at a rate of 15l/min. answer the following questions. 1. how much salt is in the tank after t minutes? answer (in kilograms): s(t) = 2. how much salt is in the tank after 5 hours? answer (in kilograms):