The transportation of a batch of earthquake relief materials can be completed in 8 hours by large and small trucks at the same time, and can be completed in 10 hours if the large trucks are used alone. How many hours will it take to transport it by a small truck alone?
运送一批抗震救灾物资，由大、小卡车同时运送，8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 / 8</gadget>
<output>1/8 = around 0.125</output>

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

<gadget id="calculator">(1/8) - (1/10)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 / (1/40)</gadget>
<output>40</output>

<result>40</result>