For a section of the road, the car has traveled 65% of the whole journey. At this time, it is 30 kilometers away from the midpoint. How many kilometers is the whole journey?
一段路，汽车已经行了全程的65%，这时离中点30千米，全程是多少千米？
<gadget id="calculator">65 / 100</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(13/20) - (1/2)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">30 / (3/20)</gadget>
<output>200</output>

<result>200</result>