Two passenger and freight vehicles depart from opposite places at the same time and meet each other after 4 hours. The speed of the passenger car is 115 km/h and the speed of the truck is 85 km/h. How many kilometers are the distance between the two places?
客货两车同时从两地相对开出，经4小时相遇．客车速度是115千米/时，货车速度是85千米/时．两地相距多少千米？
<gadget id="calculator">115 + 85</gadget>
<output>200</output>

<gadget id="calculator">200 * 4</gadget>
<output>800</output>

<result>800</result>