Mixing Salt and Water with Changing Volume

This is a sequel to my video "Mixing Salt and Water - First Order Differential Equations". Please review this tutorial first. Link:    • Mixing Salt and Water - First Order Differ...   This video demonstrates modelling of a mixing problem with changing (unsteady) reservoir volume. Thanks for watching. Please give me a "thumbs up" if you have found this video helpful. Check out my playlist on Differential Equations:   • Calculus: Differential Equations   Graph at the end of the video created with Desmos Graphing Calculator: https://www.desmos.com/calculator Please ask me a maths question by commenting below and I will try to help you in future videos. I would really appreciate any small donation which will help me to help more math students of the world. Please donate here: https://paypal.me/MasterWu Follow me on Twitter! twitter.com/MasterWuMath