Use the same water pipes to fill the pool with water. It takes 20 minutes to fill the pool with 3 water pipes. How many minutes can it take to fill the pool with 10 water pipes?
用同样地水管给水池注水，用3根水管注水20分钟可将水池注满，那么用10根水管多少分钟可将水池注满．
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) / 3</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/60) * 10</gadget>
<output>1/6 = around 0.166667</output>

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

<result>6</result>