car drives from the east city to the west city. After traveling for a certain distance, it is 210 kilometers away from the west city, and then travels 20% of the whole journey. At this time, the ratio of the distance traveled to the distance not traveled is 3:2. How many kilometers are there between the east and west cities?
一辆汽车从东城开往西城，行了一段路程后，离西城还有210千米，接着又行了全程的20%，这时已行路程与未行路程的比是3：2．东、西两城相距多少千米？
<gadget id="calculator">0.2 - 0.6</gadget>
<output>-0.4</output>

<gadget id="calculator">1 + (-0.4)</gadget>
<output>0.6</output>

<gadget id="calculator">210 / 0.6</gadget>
<output>350</output>

<result>350</result>