Uncle Wang set off from the county seat to Wangzhuang to deliver fertilizers. It took 3 hours to go at a speed of 40 kilometers per hour, and 2 hours to return; how many kilometers per hour did the average travel on the return?
王叔叔从县城出发去王庄送化肥．去时按照每小时40千米的速度用了3小时，返回时用了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>