A truck departs from place A to deliver goods to place B. It travels 45 kilometers per hour when it goes there. It can reach place B in 12 hours. It travels 60 kilometers per hour when it returns. How long does it take to return?
一辆卡车从甲地出发到乙地送货，去时每小时行45千米，12小时可以到达乙地，回来时每小时行60千米，用多长时间能返回？
<gadget id="calculator">12 / 60</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">45 * (1/5)</gadget>
<output>9</output>

<result>9</result>