The distance between A and B stations is 900 kilometers, and a freight train and a passenger train depart from A and B respectively at the same time. The truck travels 80 kilometers per hour, and the bus travels 120 kilometers per hour. How many hours will it take for the two vehicles to meet on the way? (do it in two ways)
甲乙两站相距900千米，一列货车和一列客车分别同时从甲乙两站相对开出．货车每小时行80千米，客车每小时行120千米，经过多少小时两车在途中相遇？(用两种方法做)
<gadget id="calculator">80 + 120</gadget>
<output>200</output>

<gadget id="calculator">900 / 200</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>