There is a well that continuously gushes out spring water, and the amount of water that gushes out every minute is equal. If 4 pumps are used to pump water, the water can be pumped in 40 minutes. If 5 pumps are used to pump water, the water can be pumped in 30 minutes. It is required within 24 minutes How many pumps are needed to pump the well water.
有一口井，继续不断涌出泉水，每分钟涌出的水量相等，如果用4架抽水机来抽水，40分钟可以抽完，如果使用5架抽水机来抽水，30分钟可能抽完，要求24分钟内抽完井水，需抽水机多少架．
<gadget id="calculator">4 * 40</gadget>
<output>160</output>

<gadget id="calculator">40 * 4</gadget>
<output>160</output>

<gadget id="calculator">30 * 5</gadget>
<output>150</output>

<gadget id="calculator">160 - 150</gadget>
<output>10</output>

<gadget id="calculator">40 - 30</gadget>
<output>10</output>

<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<gadget id="calculator">1 * 40</gadget>
<output>40</output>

<gadget id="calculator">160 - 40</gadget>
<output>120</output>

<gadget id="calculator">1 * 24</gadget>
<output>24</output>

<gadget id="calculator">120 + 24</gadget>
<output>144</output>

<gadget id="calculator">144 / 24</gadget>
<output>6</output>

<result>6</result>