It takes 10 minutes for A to type a manuscript alone, and 15 minutes for B to type alone. How many minutes will it take for two people to type together?
打一篇文稿，甲单独打需要10分钟，乙单独打需要15分钟，如果两人合打，需要多少分钟？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">(1/10) + (1/15)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / (1/6)</gadget>
<output>6</output>

<result>6</result>