How many seconds does it take for a 205-meter-long train to pass through a 275-meter-long tunnel at a speed of 24 meters per second?
一列长205米的火车以24米/秒的速度通过一个长为275米的隧道，一共需要多少秒．
<gadget id="calculator">205 + 275</gadget>
<output>480</output>

<gadget id="calculator">480 / 24</gadget>
<output>20</output>

<result>20</result>