pool is equipped with two outlet pipes A and B and an inlet pipe C. When A and C are opened together for 10 hours, the full pool can be drained. When B and C are opened together for 5 hours, the full pool can be drained. The three pipes are opened together 2 The water in the full pool can be drained in one hour, so how many hours will it take to fill the empty pool with water by only opening the C pipe?
一个水池装有甲、乙两个出水管和丙进水管，甲、丙同开10小时可将满池水放干，乙、丙同开5小时，可将满池水放干，三管齐开2小时可将满池水放干，那么单开丙管将空池注满水需多少小时？
<gadget id="calculator">1 - 1</gadget>
<output>0</output>

<gadget id="calculator">1 + 0</gadget>
<output>1</output>

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

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) - (1/10) - (1/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

<result>5</result>