It takes 6 hours for two students A and B to make an airplane model together, and it takes 10 hours for B to do it alone. How many hours does it take for A to do it alone?
甲乙两位同学一起做一家飞机模型要6小时完成，乙单独做要10小时完成，甲单独做需要多少小时完成．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/6) - (1/10)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>