A tank is filled with 1000 liters of pure water. Brine having 0.08 kg of salt per liter enters tank at 5 liters per minute. Another brine solution containing 0.08 kg of salt for each liter enters tank at 8 liters per minute. The contents of tank are kept thoroughly mixed and drains from the tank at 13 liters per minute. A. Find out the differential equation which states this system. Let S(t) denote number of kg of salt in tank after t minutes. dS/dt= B. Solve differential equation for S(t). S(t)=