The slow train is 125 meters long and travels at a speed of 17 meters per second. The fast train is 140 meters long and travels at a speed of 22 meters per second. The slow train is driving in front and the fast train is catching up from behind. How much time does the slow train take?
慢车车长125米，车速每秒行17米，快车车长140米，车速每秒行22米，慢车在前面行驶，快车从后面追上来，那么，快车从追上慢车的车尾到完全超过慢车需要多少时间？
<gadget id="calculator">140 + 125</gadget>
<output>265</output>

<gadget id="calculator">22 - 17</gadget>
<output>5</output>

<gadget id="calculator">265 / 5</gadget>
<output>53</output>

<result>53</result>