The whole journey from Zhuhai to Guangzhou is 180 kilometers longer. The fast train and the slow train respectively drive in opposite directions from two places at the same time, and the two trains meet each other after 1.5 hours. The slow train travels 48 kilometers per hour, how many kilometers per hour does the express train travel?
珠海到广州全程越长180千米．快车和慢车分别从两地同时相向开车，1.5小时候两车相遇．慢车每小时行48千米，快车每小时行多少千米？
<gadget id="calculator">180 / 1.5</gadget>
<output>120</output>

<gadget id="calculator">120 - 48</gadget>
<output>72</output>

<result>72</result>