A cargo ship sailed from Shanghai to Guangzhou, and it has already traveled 35% of the journey. At this time, it is 280 kilometers away from Shanghai. How many kilometers is the voyage from Shanghai to Guangzhou?
一艘货轮从上海开往广州，已经行了全程的35%，这时离上海280千米，上海到广州的航程是多少千米？
<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">280 / (7/20)</gadget>
<output>800</output>

<result>800</result>