Two trains start opposite each other from two cities. When they travel for 2.4 hours, the distance between the two trains is 40% of the whole journey. It is known that train A is 20% faster than train B, and train B travels 45 kilometers per hour. The length of the railway between the two cities is How many kilometers?
两列火车从两个城市相对开出，行驶2.4小时候，两车相距全程的40%，已知甲车速度比乙车快20%，乙车每小时行驶45千米，两城市间的铁路长多少千米？
<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">54 + 45</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>