A train travels from A to B for 3/5 of the journey, and it is 600 kilometers away from B. How many kilometers are there between A and B?
一列火车从甲地开往乙地，行了全程的(3/5)，距乙地还有600千米，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 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">600 / (2/5)</gadget>
<output>1_500</output>

<result>1_500</result>