Let the cube's volume be s&sup3;. Split equally into 4 cuboids, each gets s&sup3;/4.<br><br>Water from two of them = 2 × (s&sup3;/4) = s&sup3;/2.<br>This fills a tank with base 24 × 9 cm to height 4 cm:<br>Volume in tank = 24 × 9 × 4 = 864 cm&sup3;.<br><br>s&sup3;/2 = 864<br>s&sup3; = 1728<br>s = \( \sqrt[3]{1728} \) = 12 cm.<br><br>Final Answer: 12 cm