A passenger car travels 54 kilometers on the first day, 90 kilometers on the second day, and 78 kilometers on the third day. How many kilometers does this passenger car travel per day on average?
一辆客车，第一天行了54千米，第二天行90千米，第三天行78千米，这辆客车平均每天行多少千米？
<gadget id="calculator">54 + 90 + 78</gadget>
<output>222</output>

<gadget id="calculator">222 / 3</gadget>
<output>74</output>

<result>74</result>