The lengths of fast and slow trains are 150 meters and 200 meters respectively, and they run opposite each other on two parallel tracks. If it takes 6 seconds for the person sitting in the slow car to see the fast car passing through the window, how long does it take for the person sitting in the fast car to see the slow car passing through the window?
快、慢两列车的长分别是150米和200米，相向行驶在两条平行轨道上．若坐在慢车上的人见快车驶过窗口的时间是6秒，那么坐在快车上的人见慢车驶过窗口所用的时间是多少？
<gadget id="calculator">150 / 6</gadget>
<output>25</output>

<gadget id="calculator">200 / 25</gadget>
<output>8</output>

<result>8</result>