There is a project, teams A and B cooperate to complete it in 4 days, team A alone completes it in 6 days, how many days will it take for team B to complete the whole project alone (1/4).
有一项工程，甲、乙两队合作4天完成，甲队独做6天完成，乙队独做全工程的(1/4)要多少天．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/4) - (1/6)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/4) / (1/12)</gadget>
<output>3</output>

<result>3</result>