The distance between the two places is 450 kilometers. Cars A and B drive towards each other at the same time. Car A travels 40 kilometers per hour and meets car B after 5 hours. How many kilometers does car B travel per hour? (solution by equation)
两地相距450千米，甲、乙两车同时从两地相对开去．甲车每小时行40千米，5小时后与乙车相遇．乙车每小时行多少千米？(用方程解)
<gadget id="calculator">40 * 5</gadget>
<output>200</output>

<gadget id="calculator">450 - 200</gadget>
<output>250</output>

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

<result>50</result>