Give a reason for your answer. Well, what would make it increasing? Well, if the rate at which things are going in is larger than the rate of things going out, then the amount of water would be increasing. But if it's the other way around, if we're draining faster at t equals three, then things are flowing into the pipe, well then the amount of water would be decreasing. So, if r of t greater than, actually let me write it this way, if r of three, when t equals three, because t is given in hour, t is measured in hours, if r of three is greater than d of three, that means water is flowing in at a higher rate than leaving. So that means that water in pipe, right then, then water in pipe increasing. And then if it's the other way around, if d of three is greater than r of three, then water in pipe decreasing.