It takes 3 days for Team A to complete a project alone, and 5 days for Team B to complete it alone. How many days are there left for the two teams to cooperate (1/5).
一项工程，甲队单独完成要3天，乙队单独完成要5天，甲乙两队合作多少天还剩下工程的(1/5)．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) + (1/5)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(4/5) / (8/15)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>