A car travels 60 kilometers per hour for the first 2 hours and 70 kilometers per hour for the next 3 hours. What is the average speed of the car in kilometers per hour?
一辆汽车前2小时每小时行60千米，后3小时每小时行70千米，这辆汽车的平均速度是多少千米/小时．
<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">70 * 3</gadget>
<output>210</output>

<gadget id="calculator">120 + 210</gadget>
<output>330</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">330 / 5</gadget>
<output>66</output>

<result>66</result>