Xiao Pang uses two stopwatches to measure the speed of a train. He found that it takes 40 seconds for the train to pass a 660-meter bridge, and it takes 10 seconds for the train to pass by him at the same speed. Please calculate the length of the train in meters based on the data provided by Xiaopang.
小胖用两个秒表测一列火车的车速．他发现这列火车通过一座660米的大桥需要40秒，以同样的速度从他身边开过需要10秒，请你根据小胖提供的数据算出火车的车身长是多少米．
<gadget id="calculator">40 - 10</gadget>
<output>30</output>

<gadget id="calculator">660 / 30</gadget>
<output>22</output>

<gadget id="calculator">22 * 10</gadget>
<output>220</output>

<result>220</result>