The two lines represent the amount of water, over time, in two tanks that are the same size. Which container is filling more quickly? Explain how you know. Two lines graphed in a coordinate plane labeled "A" and "B". The horizontal axis is labeled "time, in minutes" and the vertical axis is labeled "water, in gallons." Line A begins at the origin and moves steeply upward and to the right. Line B also begins at the origin and moves steadily upward and to the right.