Two trains depart from two cities 480 kilometers apart at the same time and travel toward each other. Car A travels 45 kilometers per hour, and train B travels 42 kilometers per hour. After 4 hours, how many kilometers are the distance between the two trains?
两列火车同时从相距480千米的两个城市出发，相向而行，甲车每小时行驶45千米，乙车每小时行驶42千米，4小时后，两列火车相距多少千米？
<gadget id="calculator">45 + 42</gadget>
<output>87</output>

<gadget id="calculator">87 * 4</gadget>
<output>348</output>

<gadget id="calculator">480 - 348</gadget>
<output>132</output>

<result>132</result>