A manuscript has a total of 2,000 words. It takes 4 minutes for Mr. Li to type alone, 6 minutes for Mr. Wang to type alone, and how many minutes for two people to type together?
一份稿件共2000个字，李老师单独打要4分钟，王老师单独打要6分钟，两人合打需要几分钟？
<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>5/12 = around 0.416667</output>

<gadget id="calculator">1 / (5/12)</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>