A and B work together to complete a project in 10 hours, A alone in 14 hours, and B alone in how many hours.
一项工程，甲、乙合做需10小时完成，甲单独做14小时完成，乙单独做需多少小时完成．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 14</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">(1/10) - (1/14)</gadget>
<output>1/35 = around 0.028571</output>

<gadget id="calculator">1 / (1/35)</gadget>
<output>35</output>

<result>35</result>