A project, teams A and B cooperate to complete it in 36 days; teams B and C cooperate to complete it in 45 days; teams A and C cooperate to complete it in 60 days. Ask Team A how many days it will take to complete it alone.
一件工程，甲、乙两队合做，36天完成；乙、丙两队合做，45天完成；甲、丙两队合做，60天完成．问甲队独做，需要多少天完成．
<gadget id="calculator">1 / 36</gadget>
<output>1/36 = around 0.027778</output>

<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">1 / 45</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">(1/60) - (1/45)</gadget>
<output>-1/180 = around -0.005556</output>

<gadget id="calculator">(1/36) + (-1/180)</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">(1/45) / 2</gadget>
<output>1/90 = around 0.011111</output>

<gadget id="calculator">1 / (1/90)</gadget>
<output>90</output>

<result>90</result>