A 70-meter-long train needs to pass a 570-meter-long bridge. The train travels 20 meters per second. How long does it take for all the trains to cross the bridge?
一列长70米的火车要通过一座长570米的大桥，火车每秒钟行20米，火车全部过桥需要多少时间？
<gadget id="calculator">70 + 570</gadget>
<output>640</output>

<gadget id="calculator">640 / 20</gadget>
<output>32</output>

<result>32</result>