Type a manuscript, A can finish it in 12 hours, B can finish it in 8 hours, if two people cooperate, how many hours can they finish?
打一份稿件，甲12小时可以完成，乙8小时可以完成，如果两人合作，几小时可以完成？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/12) + (1/8)</gadget>
<output>5/24 = around 0.208333</output>

<gadget id="calculator">1 / (5/24)</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>