Uncle Wang set off from the county town to deliver fertilizers to Wangzhuang Township with a truck. The speed of the truck was 40 km/h, it arrived in 3 hours, and it took only 2 hours to return. What was the speed of the truck when it returned?
王叔叔用一辆卡车从县城出发去王庄乡送化肥．去时的速度是40千米/时，3小时到达，返回时只用了2小时，这辆卡车返回时的速度是多少？
<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>