It takes 10 hours to go from A to B by bus and 15 hours by truck. Now the two cars leave opposite to each other respectively, and when they meet, the bus travels exactly 240 kilometers. How many kilometers are there between A and B?
从甲地到乙地客车要10小时，货车要15小时．现在两车分别从两地相对开出，相遇时客车正好行了240千米．甲、乙两地相距多少千米？
<gadget id="calculator">15 + 10</gadget>
<output>25</output>

<gadget id="calculator">15 / 25</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">240 / (3/5)</gadget>
<output>400</output>

<result>400</result>