A car travels 80 kilometers in 1.5 hours, stops for 30 minutes due to traffic jam, and then travels 100 kilometers in 2 hours. What is the average speed of the car in kilometers during the whole process? /Hour.
一辆轿车在一次旅行中用1.5小时行了80千米，后因交通堵塞停了30分钟，然后又用2小时行了100千米，这辆车在整个过程中的平均速度是多少千米/小时．
<gadget id="calculator">80 + 100</gadget>
<output>180</output>

<gadget id="calculator">1.5 + 0.5 + 2</gadget>
<output>4</output>

<gadget id="calculator">180 / 4</gadget>
<output>45</output>

<result>45</result>