A pool has a water inlet pipe and a water outlet pipe. Open the water inlet pipe alone for 1 hour to fill the pool, and open the water outlet pipe for 40 minutes to drain the full pool of water. Now there is water (1/3) in the pool. Run out the water in an hour?
一个水池有进水管和出水管各一根，单开进水管1小时注满水池，单开出水管40分把满池水放完，现在池内已存水(1/3)，两管齐开几小时把水放完？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>