The Shanghai-Hangzhou high-speed train has been opened, with a maximum speed of 416.6 km/h during operation. A high-speed rail train from Hangzhou to Shanghai has traveled the entire distance (3/5), and it is exactly 25 kilometers away from the midpoint. How many kilometers is the Shanghai-Hangzhou high-speed rail?
沪杭高铁列车已经开通，运行时最高时速达到416.6千米/时．一列高铁列车从杭州开往上海，已经行了全程的(3/5)，恰好距中点25千米处，沪杭高铁长约多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/5) - (1/2)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">25 / (1/10)</gadget>
<output>250</output>

<result>250</result>