The distance between Wuping and Xiamen is 460 kilometers. An express passenger car drove from Wuping to Xiamen, and at the same time, a freight car drove from Xiamen to Wuping. After 4 hours, the two cars met on the way. Express passenger cars travel an average of 65 kilometers per hour, how many kilometers per hour do trucks travel on average?
武平到厦门相距460千米．一辆快运客车从武平开往厦门，同时也有一辆货运汽车从厦门开往武平，经过4小时两辆汽车在途中相遇．快运客车平均每小时行65千米，货车平均每小时行了多少千米？
<gadget id="calculator">460 / 4</gadget>
<output>115</output>

<gadget id="calculator">115 - 65</gadget>
<output>50</output>

<result>50</result>