Cars A and B leave from cities A and B at the same time. Car A travels an average of 75.5 kilometers per hour, and car B travels an average of 65.5 kilometers per hour. After 4.5 hours, the two cars meet on the way. How many kilometers are there between A and B?
甲、乙两车从A、B两城同时相对开出，甲车平均每小时行驶75.5千米，乙车平均每小时行驶65.5千米，经过4.5小时两车在途中相遇．A、B两城相距多少千米？
<gadget id="calculator">75.5 + 65.5</gadget>
<output>141</output>

<gadget id="calculator">141 * 4.5</gadget>
<output>634.5</output>

<result>634.5</result>