Let the cube's volume be s&sup3;. Split equally into 6 cuboids, each gets s&sup3;/6.<br><br>Water from four of them = 4 × (s&sup3;/6) = 2s&sup3;/3.<br>This fills a tank with base 24 × 6 cm to height 8 cm:<br>Volume in tank = 24 × 6 × 8 = 1152 cm&sup3;.<br><br>2s&sup3;/3 = 1152<br>s&sup3; = 1152 × (3/2) = 1728<br>s = \( \sqrt[3]{1728} \) = 12 cm.<br><br>Final Answer: 12 cm