A car has traveled the entire distance (2/3) from Beijing to Shanghai, and there are 800 kilometers left to reach Shanghai. How far is it from Beijing to Shanghai?
一辆汽车从北京开往上海，已经行了全程的(2/3)，还剩800千米到上海了．北京到上海有多少距离？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">800 / (1/3)</gadget>
<output>2_400</output>

<result>2_400</result>