The slow car is 125 meters long and the speed is 22 meters per second. The express car is 140 meters long and the speed is 27 meters per second. How many seconds does it take for the slow car to catch up with the fast car behind?
慢车身长125米，车速每秒22米，快车身长140米，车速每秒27米，慢车在前面行驶，快车在后面追上完全超过需要多少秒．
<gadget id="calculator">125 + 140</gadget>
<output>265</output>

<gadget id="calculator">27 - 22</gadget>
<output>5</output>

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

<result>53</result>