A project, A and B cooperate to complete in 6 days, A works alone in 10 days, and B works alone in 6 days.
一项工程，甲、乙合作6天完成，甲单独干10天完成，乙单独干6天完成工程的多少．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/6) - (1/10)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 6</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>