A train moving at a constant speed takes 60 seconds from the time it enters a 320m-long tunnel to the time it passes through the tunnel. There is a fixed light on the top of the tunnel that shines vertically downward. The light shines on the train for 10 seconds. What is the length of the train? m.
一列匀速前进的火车，从它进入320m长的隧道到完全通过隧道经历了60s，隧道顶有一盏固定的灯，垂直向下发光，灯光在火车上照了10s，则这列火车的长为多少m．
<gadget id="calculator">60 - 10</gadget>
<output>50</output>

<gadget id="calculator">320 / 50</gadget>
<output>32/5 = around 6.4</output>

<gadget id="calculator">(32/5) * 10</gadget>
<output>64</output>

<result>64</result>