A train travels from city A to city B. It travels the whole distance (3/5) and exceeds the midpoint by 85 kilometers. How many kilometers is the distance between cities A and B?
一列火车从甲城开往乙城，行了全程的(3/5)，超过了中点85千米，求甲、乙两城相距多少千米？
<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">85 / (1/10)</gadget>
<output>850</output>

<result>850</result>