In a batch process, you want to concentrate a dilute acid containing 30 wt% H2PO4 and 70 wt% H2O by adding concentrated acid (90 wt% H2PO4, 5.0 wt% H2SO4, and 5.0 wt% H2O). If a tank contains 1000 kg of the dilute acid and the concentrated acid is added at a rate of 100 kg/min, how long will it take to bring dilute acid strength to 75 wt% H2PO4? What will be the final chemical composition and weight of the final mixture which is removed from the tank?