Two trains depart from cities A and B at the same time. After 2.4 hours, the distance between the two trains is 40% of the total length of the railway between the two cities. It is known that the speed of train A is 20% faster than that of train B, and train B travels 45 per hour. How many kilometers is the total length of the railway between the two cities?
两列火车从A、B两城同时相对开出，行驶2.4小时后两车距离为两城间铁路全长的40%，已知甲车速度比乙车快20%，乙车每小时行驶45千米，两城间的铁路全长是多少千米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">45 * (6/5)</gadget>
<output>54</output>

<gadget id="calculator">45 + 54</gadget>
<output>99</output>

<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">2.4 / (3/5)</gadget>
<output>4</output>

<gadget id="calculator">99 * 4</gadget>
<output>396</output>

<result>396</result>