A train from Shanghai to Tianjin travels 60% of the way, and there are 540 kilometers left. How many kilometers is the Shanghai-Tianjin railway?
一列火车从上海开往天津，行了全程的60%，还剩540千米，上海到天津铁路长多少千米？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">540 / (2/5)</gadget>
<output>1_350</output>

<result>1_350</result>