A pool has two drain pipes A and B and one water inlet pipe. If the pool is full of water, it will take 6 hours and 4 hours to drain the water by opening pipe A or pipe B respectively. If there is some water in the pool now, and when pipe A and water inlet are opened at the same time, it takes 10 hours to drain the water; and if pipe A, pipe B and water inlet are opened at the same time, it only takes 2.5 hours to drain the water After that, how much of the water in the pool accounts for the whole pool.
某水池有甲乙两个排水管和一个进水管，如果盛满一池水，单开甲管或乙管分别需要6小时和4小时才能把水排完．如果现在水池中有一部分水，并且当同时打开甲管和进水管，用了10小时就将水排完；而如果同时打开甲管、乙管和进水管，则只用2.5小时就将水排完，那么水池中的水占全部水池的多少．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">10 * (1/6)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">2.5 * (1/6)</gadget>
<output>0.416667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2.5 * (1/4)</gadget>
<output>0.625</output>

<gadget id="calculator">(5/3) - 0.416667 - 0.625</gadget>
<output>0.625</output>

<gadget id="calculator">10 - 2.5</gadget>
<output>7.5</output>

<gadget id="calculator">0.625 / 7.5</gadget>
<output>0.083333</output>

<gadget id="calculator">(1/6) - 0.083333</gadget>
<output>0.083334</output>

<gadget id="calculator">10 * 0.083334</gadget>
<output>0.83334</output>

<result>0.83334</result>