Two cars drive towards each other at the same time from two cities 360 kilometers apart. They meet each other in 2.5 hours. Car A travels 63 kilometers per hour. How many kilometers per hour does car B travel?
两车从相距360千米的两城同时相向而行，2.5小时相遇，甲车每小时63千米，乙车每小时行多少千米？
<gadget id="calculator">360 / 2.5</gadget>
<output>144</output>

<gadget id="calculator">144 - 63</gadget>
<output>81</output>

<result>81</result>