A fast train is 150 meters long and travels 22 meters per second. A slow train is 100 meters long and travels 14 meters per second. How many seconds does it take for the fast train to overtake the slow train from behind?
一列快车长150米，每秒行22米，一列慢车长100米，每秒行14米，快车从后面追上慢车到超过慢车，共需要几秒钟？
<gadget id="calculator">150 + 100</gadget>
<output>250</output>

<gadget id="calculator">22 - 14</gadget>
<output>8</output>

<gadget id="calculator">250 / 8</gadget>
<output>125/4 = around 31.25</output>

<result>125/4 = around 31.25</result>