A large pool has a drainage pipe at the bottom, which releases a certain amount of water evenly every minute, and at the same time uses the same water pump to pump water from above. Four pumps can be used to drain the water in 8 hours. If 6 water pumps are used for 6 hours, the water can also be drained. If you want to drain the water in 3 hours, at least how many such water pumps are needed?
一个大水池，底部有一个排水管，每分均匀地放出一定数量的水，同时从上面用相同的抽水机抽水，用4台抽水机8小时可将水抽干．若用6台抽水机6小时也可将水抽干．如果要想3小时把水抽干，至少需要多少台这样的抽水机？
<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">36 - 32</gadget>
<output>4</output>

<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">32 + 16</gadget>
<output>48</output>

<gadget id="calculator">48 / 1</gadget>
<output>48</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">48 - 6</gadget>
<output>42</output>

<gadget id="calculator">42 / 3</gadget>
<output>14</output>

<result>14</result>