The distance between A and B is 1920 kilometers. A passenger car drives from A to B at 8:00 am, and a freight train drives from B to A at 2:00 pm. The two cars meet at 8:00 am the next day. m, how many kilometers does the truck travel per hour?
甲乙两地相距1920千米，上午8时一列客车从甲地驶往乙地，下午2时一列货车从乙地驶往甲地，第二天上午8时两车相遇，客车每小时行50千米，货车每小时行多少千米？
<gadget id="calculator">50 * 6</gadget>
<output>300</output>

<gadget id="calculator">1_920 - 300</gadget>
<output>1_620</output>

<gadget id="calculator">1_620 / 18</gadget>
<output>90</output>

<gadget id="calculator">90 - 50</gadget>
<output>40</output>

<result>40</result>