Two cars drive out from city A and city B at the same time. Car A travels 98.4 kilometers per hour, and car B travels 71.6 kilometers per hour. After 4.5 hours, the two cars meet. How many kilometers is the distance between city A and city B?
两辆汽车分别从A城和B城同时相对开出，甲车每小时行98.4千米，乙每小时行71.6千米，4.5小时后两车相遇．问A、B城相距多少千米？
<gadget id="calculator">98.4 + 71.6</gadget>
<output>170</output>

<gadget id="calculator">170 * 4.5</gadget>
<output>765</output>

<result>765</result>