It took 5 hours for Uncle Wang to transport the goods from A to B for 270 kilometers, and it took 4 hours to return to A from B empty.
王叔叔从甲地运货到乙地行驶了270千米用了5时，又从乙地空车原路返回甲地用了4时，王叔叔往返平均每时行驶多少千米？
<gadget id="calculator">270 * 2</gadget>
<output>540</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">540 / 9</gadget>
<output>60</output>

<result>60</result>