A batch of anti-SARS materials can be transported by large and small trucks at the same time, and it can be transported in 6 hours. If it is transported by a large truck alone, it can be transported in 10 hours. How many hours will it take to transport it by a small truck alone?
运送一批抗"非典"物资，由大、小卡车同时运送，6小时可以运完，如果用大卡车单独运，10小时可以运完．如果用小卡车单独运，需要几小时运完？
<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>