It is 380 kilometers from Jinan to Qingdao. A car will be 50 kilometers away from Qingdao after 3 hours from Jinan. How many kilometers does this car travel on average per hour?
济南到青岛有380千米，一辆汽车从济南出发3小时后离青岛还有50千米，这辆汽车平均每小时行多少千米？
<gadget id="calculator">380 - 50</gadget>
<output>330</output>

<gadget id="calculator">330 / 3</gadget>
<output>110</output>

<result>110</result>