Two trains A and B are traveling towards each other at the same time from two places 600 kilometers apart. After 2.5 hours, the distance between the two trains is still 220 kilometers. It is known that car A travels 80 kilometers per hour, how many kilometers per hour does car B travel?
甲乙两列火车分别从相距600千米的两地同时相向而行，2.5小时后两车还相距220千米．已知甲车每小时行80千米，乙车每小时行多少千米？
<gadget id="calculator">80 * 2.5</gadget>
<output>200</output>

<gadget id="calculator">600 - 200 - 220</gadget>
<output>180</output>

<gadget id="calculator">180 / 2.5</gadget>
<output>72</output>

<result>72</result>