car drove from Dujiangyan to Chongqing. It traveled 25% of the whole journey in the first hour and 30% in the second hour. At this time, it was still 135 kilometers away from Chongqing. What is the distance between Dujiangyan and Chongqing?
辆汽车从都江堰开往重庆，第一小时行了全程的25%，第二小时行了30%，这时离重庆还有135千米．求都江堰与重庆之间的距离是多少？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (1/4) - (3/10)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">135 / (9/20)</gadget>
<output>300</output>

<result>300</result>