Two trains, A and B, depart from two places 450 kilometers apart at the same time. Car A travels 45 kilometers every short distance. After 5 hours, the distance between the two trains is still 25 kilometers. How many kilometers does train B travel per hour?
甲乙两列火车同时从相距450千米的两地相对开出，甲车每小行行45千米，5小时后两车还相距25千米，乙车每小时行多少千米？
<gadget id="calculator">45 * 5</gadget>
<output>225</output>

<gadget id="calculator">450 - 25 - 225</gadget>
<output>200</output>

<gadget id="calculator">200 / 5</gadget>
<output>40</output>

<result>40</result>