When a train travels from A to B for the whole distance (3/5), the distance between the train and the midpoint of the two places is 240 kilometers. How many kilometers is the distance between A and B?
一列火车从甲地开往乙地，行了全程的(3/5)时，这列火车与两地中点的距离是240千米，甲乙两地相距多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/5) - (1/2)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">240 / (1/10)</gadget>
<output>2_400</output>

<result>2_400</result>