There are two water pipes A and B in the pool. Open pipe A first and fill half of the pool in 3 hours, then open pipe B, and fill the pool with water from both pipes at the same time. After another 2 hours, the pool will be filled. If pipe B can fill 18 cubic meters of water per hour, what is the volume of the pool in cubic meters?
水池装有甲、乙两个水管，先开甲管，3小时注满水池的一半，然后开放乙管，两管同时往池内注水，又经过2小时才注满水池．如果乙管每小时能注水18立方米，那么这个水池的容积是多少立方米．
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / 3</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">(1/6) * 5</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">36 / (1/6)</gadget>
<output>216</output>

<result>216</result>