Two trucks depart from cities A and B at the same time. The big truck travels an average of 84 kilometers per hour, and the small truck travels an average of 76 kilometers per hour. After 5 hours, the two trucks meet at the high-speed service area. How many miles is the distance between A and B?
两辆货车分别从甲、乙两城同时相对开出，大货车平均每小时行84千米，小货车平均每小时行76千米，5小时后两车在高速服务区相遇．甲、乙两城相距多少千米？
<gadget id="calculator">84 + 76</gadget>
<output>160</output>

<gadget id="calculator">160 * 5</gadget>
<output>800</output>

<result>800</result>