A car drives from city A to city B. It travels the whole distance (1/4) in the first hour and 90 kilometers in the second hour. At this time, it is still the whole distance (9/20) from city B. City A How many kilometers is the distance to City B?
一辆汽车从甲城开往乙城，第一小时行了全程的(1/4)，第二小时行使了90千米，这时离乙城还有全程的(9/20)，甲城到乙城的路程是多少千米？
<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(9/20) - (1/4)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">90 / (1/5)</gadget>
<output>450</output>

<result>450</result>