A truck from Xintai to Jinan. It took 4 hours to go there with an average speed of 60 km/h, and it took 5 hours to return. What is the average speed when you return?
一辆货车车从新泰到济南．去时用了4小时，平均时速60千米/时，返回时用了5小时，返回时平均速度是多少？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">60 * (4/5)</gadget>
<output>48</output>

<result>48</result>