A passenger car and a truck are traveling towards each other from two places at the same time. It is known that the passenger car travels 100 kilometers per hour, and the truck travels 65 kilometers per hour. After 3.5 hours, how many kilometers are the distance between the two places?
一辆客车和一辆货车同时从两地相向而行．已知客车每小时行100千米，货车每小时行65千米，经过3.5小时相遇，两地相距多少千米？
<gadget id="calculator">100 + 65</gadget>
<output>165</output>

<gadget id="calculator">165 * 3.5</gadget>
<output>577.5</output>

<result>577.5</result>