A car travels 64 kilometers per hour for the first 3 hours and 54 kilometers per hour for the next 2 hours. What is the average speed of this car in kilometers?
一辆汽车，前3小时每小时行64千米，后2小时每小时行54千米，这辆汽车的平均速度是多少千米？
<gadget id="calculator">64 * 3</gadget>
<output>192</output>

<gadget id="calculator">54 * 2</gadget>
<output>108</output>

<gadget id="calculator">192 + 108</gadget>
<output>300</output>

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

<gadget id="calculator">300 / 5</gadget>
<output>60</output>

<result>60</result>