Two buses, A and B, commute between A and B. The two buses depart at the same time and meet at a distance of 15 kilometers from the midpoint. It is known that A travels 30 kilometers per hour, and B travels 25 kilometers per hour. Find A , How many kilometers is the distance between the two places?
甲、乙两辆公交车往返于A、B两地，两车同时出发相遇时距中点15千米，已知甲车每小时行30千米，乙车每小时行25千米，求A、B两地相距多少千米？
<gadget id="calculator">30 - 25</gadget>
<output>5</output>

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

<gadget id="calculator">30 + 25</gadget>
<output>55</output>

<gadget id="calculator">15 * (2/5) * 55</gadget>
<output>330</output>

<result>330</result>