A car travels 35% of the total distance from city A to city B, and there are still 45 kilometers away from the midpoint. How many kilometers is it from city A to city B?
一辆汽车从A城去B城，行了总路程的35%，离中点还有45千米，A城去B城有多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(1/2) - (7/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">45 / (3/20)</gadget>
<output>300</output>

<result>300</result>