A 150-meter-long train travels through a 300-meter tunnel at a speed of 18 meters per second. How long does it take for the train to cross the tunnel (enter the tunnel until it leaves completely)?
长150米的火车以每秒18米的速度穿越一条300米的隧道．问火车穿越隧道(进入隧道直到完全离开)要多少时间？
<gadget id="calculator">150 + 300</gadget>
<output>450</output>

<gadget id="calculator">450 / 18</gadget>
<output>25</output>

<result>25</result>