An express train and a slow train are traveling from A to B at the same time. The slow train travels 50 kilometers per hour, and the express train is 20% faster than the slow train per hour. After 2.5 hours, the two trains meet. How many kilometers are the distance between A and B?
一列快车和一列慢车同时从甲乙两地相同而行，慢车每小时行50千米，快车每小时比慢车快20%，经过2.5小时，两车相遇，请问甲乙两地相距多少千米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">50 * (6/5)</gadget>
<output>60</output>

<gadget id="calculator">50 + 60</gadget>
<output>110</output>

<gadget id="calculator">110 * 2.5</gadget>
<output>275</output>

<result>275</result>