It takes 10 hours for a car to travel from station A to station B, and 15 hours for a bus to travel from station B to station A. The two cars depart from the two stations at the same time and drive towards each other. They are 20 kilometers away from the midpoint. meet. How many kilometers are there between A and B?
一辆小汽车从甲站开往乙站需要10小时，一辆大客车从乙地开往甲站需要15小时，两车同时从两站开出，相向而行，在离中点20千米相遇．甲、乙两站相距多少千米？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

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

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / (1/5)</gadget>
<output>10</output>

<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<result>200</result>