The body of the local train is 125 meters long and its speed is 17 m/s; the body of the express train is 140 meters long and its speed is 22 m/s. How long does it take for the slow car to catch up with the fast car to completely overtake it?
慢车车身长125米，车速17米/秒；快车车身长140米，车速22米/秒．慢车在前面行驶，快车在后面追上到完全超过需要多少时间？
<gadget id="calculator">125 + 140</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>