To build a road, teams A and B can complete it in 6 days. If team A alone can complete it in 10 days, how many days can team B alone repair it?
修一条公路，甲、乙两队合修6天可以完成，如果甲队单独修10天可以完成，那么乙队单独修多少天可以完成．
<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>