Two trains A and B leave at the same time from two places 475 km apart. Train A travels 40 km per hour. After 5 hours, the two trains are still 25 km apart and have not met. How many kilometers per hour does train B travel? (solution by equation)
甲乙两列火车同时从相距475km的两两地相对开出，甲车每小时行40km，5小时后两车还相距25km没有相遇，乙车每小时行多少km？(用方程解)
<gadget id="calculator">40 * 5</gadget>
<output>200</output>

<gadget id="calculator">475 - 200 - 25</gadget>
<output>250</output>

<gadget id="calculator">250 / 5</gadget>
<output>50</output>

<result>50</result>