There are two trains traveling in the same direction, the fast train travels 30 meters per second, and the slow train travels 22 meters per second. If counting from the alignment of the fronts of the two cars, the fast car will overtake the slow car after 24 seconds; if counting from the alignment of the rear of the two cars, the fast car will overtake the slow car after 28 seconds. How many meters is the express train long?
有两列火车同方向行使，快车每秒行30米，慢车每秒行22米．若从两车车头对齐开始算，24秒后快车超过慢车；若从两车车尾对齐开始算，28秒后快车超过慢车．快车长多少米．
<gadget id="calculator">30 - 22</gadget>
<output>8</output>

<gadget id="calculator">8 * 24</gadget>
<output>192</output>

<result>192</result>