It takes 16 seconds for a train to pass through a 420-meter subsea tunnel, and 10 seconds to pass through a 120-meter bridge. How many meters is the body length of the train?
列车通过420米的海底隧道用16秒，通过一座120米的桥梁用10秒，列车的车身长多少米．
<gadget id="calculator">420 - 120</gadget>
<output>300</output>

<gadget id="calculator">16 - 10</gadget>
<output>6</output>

<gadget id="calculator">300 / 6</gadget>
<output>50</output>

<gadget id="calculator">50 * 10</gadget>
<output>500</output>

<gadget id="calculator">500 - 120</gadget>
<output>380</output>

<result>380</result>