Two cylindrical containers, A and B, have the same height, and the ratio of the radius of the bottom surface is 2:1. When B is filled with water and poured into the empty cup A, the water surface is 2 cm lower than the height (1/3) of the cup. Find the height of the cup.
甲乙两个圆柱形容器高相等，底面半径比为2：1，当乙装满水倒向空杯甲时，水面比杯高的(1/3)低2厘米，求杯高．
<result>24</result>