Hi! I'm new here and trying to get some help solving a problem I have. It's a real problem, but for discussion purposes I've simplified it as such: Problem Description: A large tank is initially full of pure distilled water at volume of 5,000 cubic feet (cf) 50% pure vinegar is being poured into the tank at 2 cfm A faucet on the bottom of the tank is open pouring out at 2 cfm The tank has a mixer that circulates and mixes the fluid internally Question: After how many minutes would it take for the faucet to pour fluid containing 10% vinegar? Assumptions: The mixing of the vinegar and the rest of the fluid in the tank happens instantaneous and homogeneous. Please be very descriptive in your solution and how you did it. I really forgot most of my DE knowledge. Thanks! I only know that: tank concentration of vinegar after t = (volume of vinegar in after t - volume vinegar out after t) / tank volume volume of vinegar out after t is the integral of the tank concentration x flow rate out x t Please help!