A truck delivers goods from A to B, travels 60 kilometers per hour, and delivers to B in 8 hours. When it comes back, it travels 40 kilometers per hour. How long can it return?
一辆货车从甲地到乙地送货，去时每小时行60千米，8小时送到乙地．回来时每小时行40千米，它几小时能返回？
<gadget id="calculator">8 / 40</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">60 * (1/5)</gadget>
<output>12</output>

<result>12</result>