Uncle Wang went from city A to city B. He traveled the whole distance (2/5) in the first hour, and after 45% of the whole journey in the second hour, he was still 900 meters away from city B. How many thousands are there between cities A and B? rice?
王叔叔从甲城到乙城，第一个小时行了全程的(2/5)，第二个小时行了全程的45%后距乙城还有900米，甲、乙两城相距多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (2/5) - (9/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">900 / (3/20) / 1_000</gadget>
<output>6</output>

<result>6</result>