There are two cylindrical containers A and B. Initially, container A contains 2 liters of water, and container B is empty. Now pour water into the two containers at a rate of 0.4 liters per minute. After 4 minutes, the water levels in the two containers are equal. It is known that the radius of the bottom surface of container B is 5 cm, what is the diameter of the bottom surface of container A in cm? (The thickness of the container is not considered).
有A、B两个圆柱形容器，最初在A容器中装有2升的水，B容器是空的．现在往两个容器中以每分钟0.4升的速度注入水，4分钟后，两个容器的水面高度相等．已知B容器的底面半径为5厘米，A容器底面直径是多少厘米？(容器的厚度不予考虑)．
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