The distance between A and B is 165 kilometers. It takes 2.4 hours for a car to go from A to B and 2 hours to return. What is the average speed of this car going back and forth between A and B?
甲、乙两地相距165千米，一辆汽车从甲地往乙地用了2.4小时，返回时用了2小时，这辆汽车往返甲、乙两地的平均速度？
<gadget id="calculator">165 * 2</gadget>
<output>330</output>

<gadget id="calculator">2.4 + 2</gadget>
<output>4.4</output>

<gadget id="calculator">330 / 4.4</gadget>
<output>75</output>

<result>75</result>