Zhuji City delivered a batch of relief materials to the drought-stricken areas in Yunnan Province. On the first day, 30% of the whole journey was completed, and on the second day (2/5), the distance to the disaster-stricken area was still 660 kilometers. How many kilometers is the distance between Zhuji City and the disaster area?
诸暨市向云南省干旱灾区运送一批救灾物资，第一天行了全程的30%，第二天行了全程的(2/5)，这时距离灾区还有660千米．诸暨市到灾区之间的距离是多少千米？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

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

<gadget id="calculator">1 - (3/10) - (2/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">660 / (3/10)</gadget>
<output>2_200</output>

<result>2_200</result>