An express train is 150 meters long, and a slow train is 250 meters long. The two trains are running towards each other with parallel tracks. People on the slow train watch the express train passing by for 6 seconds. Then people on the express train watch How many seconds passed by with a slow car?
一列特快列车车长150米，一列慢车车长250米，两列火车相向而行，轨道平行，坐在慢车上的人看着快车驶过的时间是6秒，那么坐在快车上的人看着慢车驶过经过多少秒？
<gadget id="calculator">150 / 6</gadget>
<output>25</output>

<gadget id="calculator">250 / 25</gadget>
<output>10</output>

<result>10</result>