Uncle Li transported vegetables to the county seat. It took 3 hours to travel 40 kilometers per hour. After unloading the goods, it took only 2 hours to return the same way. How many kilometers per hour did the average return?
李叔叔运蔬菜去县城，去的时候每小时行40千米，用了3小时，卸完货后原路返回，只用了2小时，返回时平均每小时行多少千米？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">40 * (3/2)</gadget>
<output>60</output>

<result>60</result>