Volume of water in first tank = 24 &times; 15 &times; 10 = 3600 cm&sup3;.<br><br>
&bull; Base area of second tank = 20 &times; 12 = 240 cm&sup2;.<br>
&bull; Height h = Volume &divide; Base area<br>
&bull; h = 3600 &divide; 240 = 15 cm.<br>
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Final Answer: 15 cm