And I'm pouring water into this cup right now. And I'm pouring the water at a rate of 1 cubic centimeter per second. And right at this moment, there is a height of 2 centimeters of water in the cup right now. So the height right now from the bottom of the cup to this point right over here is 2 centimeters. So my question to you is, at what rate? We know the rate at which the water is flowing into the cup. We're being given a volume per time.