The distance between A and B is 360 kilometers. It took Uncle Zhang 5 hours to drive a batch of goods from A to B, and 4 hours to return. How many kilometers per hour does Uncle Zhang travel on average?
甲乙两地相距360千米，张叔叔从甲地开车送一批货物到乙地用了5小时，返回时用了4小时，张叔叔往返平均每小时行多少千米？
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">360 * (2/9)</gadget>
<output>80</output>

<result>80</result>