Changzhou-Zhuzhou Expressway (Zhuzhou-Changsha) is about 42 kilometers long, and the bus departing from Zhuzhou Station has just traveled 40% of the whole journey when it arrives at Zhuyi Intersection. How many kilometers will it take to reach Changsha Station?
长株高速(株洲-长沙)全程约42千米，从株洲站始发的班车到达株易路口时刚好行了全程的40%，到达长沙站还有多少千米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">42 * (3/5)</gadget>
<output>126/5 = around 25.2</output>

<result>126/5 = around 25.2</result>