The distance between the two railway stations is 425 kilometers. Two trains, A and B, depart opposite from each other at the same time, and meet each other after 2.5 hours. Train A travels 90 kilometers per hour. How many kilometers per hour does train B travel? (Solve by two methods of arithmetic and equation)
两个火车站相距425千米．甲、乙两列火车同时从两站相对开出，经过2.5小时相遇，甲车每小时行90千米，乙车每小时行多少千米？(用算术、方程两种方法解答)
<gadget id="calculator">90 * 2.5</gadget>
<output>225</output>

<gadget id="calculator">425 - 225</gadget>
<output>200</output>

<gadget id="calculator">200 / 2.5</gadget>
<output>80</output>

<result>80</result>