There are two trains, one is 220 meters long and travels 22 meters per second, and the other is 200 meters long and is coming towards each other. It takes 10 seconds for the two trains to meet and separate. Find the speed of the other train.
有两列火车，一列长220米，每秒行22米，另一列长200米迎面开来，两车从相遇到相离共用了10秒钟，求另一列火车的速度．
<gadget id="calculator">220 + 200</gadget>
<output>420</output>

<gadget id="calculator">420 / 10</gadget>
<output>42</output>

<gadget id="calculator">42 - 22</gadget>
<output>20</output>

<result>20</result>