It takes 10 hours for a batch of exercise books to be bound by workshop A alone, and 15 hours for binding by workshop B alone. How many hours can the two teams combine to complete this batch of exercise books?
一批练习本，由甲车间单独装订要10小时，由乙车间单独装订要15小时，两队合装多少小时可完成这批练习本？
<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>