A bus and a truck start from places A and B, and drive toward each other. The bus travels 45 kilometers per hour, and the truck travels 55 kilometers per hour. After 4 hours, the distance is still 260 kilometers. How many kilometers are there between A and B?
客车和货车从甲乙两地出发，相向而行，客车每小时行45千米，货车每小时行55千米，4小时后还相距260千米．甲乙两地相距多少千米？
<gadget id="calculator">100 * 4</gadget>
<output>400</output>

<gadget id="calculator">400 + 260</gadget>
<output>660</output>

<result>660</result>