Which Tank Will Empty First? The Answer Is Easier Than It Looks

At first glance, this puzzle seems almost too simple. Two tanks are sitting side by side, one filled with water and the other with milk. Both have an opening near the bottom, and liquid is flowing out at what appears to be a similar rate.

But there’s a small detail that changes everything.

Which tank will empty first — A or B?

Take a Close Look

Tank A contains water, while tank B contains milk. The containers appear to