The distance between A and B is 637 kilometers. Two cars drive from the two places at the same time. They meet each other in 6.5 hours. Car A travels 45 kilometers per hour. How much more kilometers does car B travel than car A per hour?
甲、乙两城相距637千米，两车从两地同时相对开出，6.5小时向遇，甲汽车每小时行45千米，乙车比甲车每小时多行多少千米？
<gadget id="calculator">637 / 6.5</gadget>
<output>98</output>

<gadget id="calculator">98 - 45 - 45</gadget>
<output>8</output>

<result>8</result>