A car drives from place A to place B. After driving for a certain distance, it is 210 kilometers away from place B, and then drives 20% of the whole distance. At this time, the ratio of the distance traveled to the distance not traveled is 3 : 2. Find the distance between places A and B.
一辆汽车从甲地向乙地行使，行了一段距离后，距离乙地还有210千米，接着又行了全程距离的20%，此时已行驶的距离与未行使的距离比为3：2，求甲乙两地的距离．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/5) + (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">210 / (3/5)</gadget>
<output>350</output>

<result>350</result>