water pool is equipped with water inlet and outlet pipes, if the water inlet pipe is only opened, the empty pool can be filled in 8 minutes, and the water outlet pipe can be opened only, and the full pool can be drained in 12 minutes. Now only open the water inlet pipe for 2 minutes before opening the water outlet pipe, how many minutes will it take to fill the pool?
一个水池装有进水管和出水管，单开进水管，8分钟可将空池注满，单开出水管，12分钟可将满池水放完．现在单开进水管2分钟以后，才打开出水管，还要多少分钟可将水池注满？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) * 2</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/8) - (1/12)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">(3/4) / (1/24)</gadget>
<output>18</output>

<result>18</result>