After Li Ming walked the whole journey (2/5) from City A to City B, he was still 25 kilometers away from the midpoint of the journey. How many miles is the distance between A and B?
李明由甲城到乙城，走了全程的(2/5)后，离全程的中点还有25千米．甲、乙两城相距多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

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

<gadget id="calculator">25 / (1/10)</gadget>
<output>250</output>

<result>250</result>