Two cars, A and B, drive oppositely from two places at the same time. Car A travels 75 kilometers per hour, and car B travels 60 kilometers per hour. After 4.5 hours, the two cars meet. How many miles is the road between the two places?
甲、乙两辆汽车同时从两地相对开出，甲车每小时行75千米，乙车每小时行60千米，经过4.5小时两车相遇．两地之间的公路长多少千米？
<gadget id="calculator">75 + 60</gadget>
<output>135</output>

<gadget id="calculator">135 * 4.5</gadget>
<output>607.5</output>

<result>607.5</result>