A project can be completed in 6 days if A and B work together, but B alone needs 15 days to complete it. What is A's work efficiency?
一项工程，甲乙合做6天完成，乙独做需要15天完成，甲的工作效率是多少
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/6) - (1/15)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>