A car drives from place A to place B. It travels an average of 60 kilometers per hour in the first 3 hours, and an average of 45 kilometers per hour in the next 2 hours. How many kilometers per hour does the car travel on average?
一辆汽车从甲地开往乙地，前3小时平均每小时行60千米，后2小时平均每小时行45千米，这辆汽车平均每小时行多少千米？
<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<gadget id="calculator">180 + 90</gadget>
<output>270</output>

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

<gadget id="calculator">270 / 5</gadget>
<output>54</output>

<result>54</result>