Two people, A and B, run around a 400-meter-long runway. If they walk back to back from the same place, they will meet after 2 minutes; if they walk in the same direction from the same place, they will meet after 20 minutes. The speed is faster than that of B, so how many meters per minute is A's speed?
甲乙二人绕长400米的跑道跑步，两人从同一地点背向而行，则经过2分钟可相遇；如果两人从同一地点同向而行，经过20分钟才相遇，且已知甲的速度比乙的速度快，那么甲的速度是每分钟多少米？
<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<gadget id="calculator">400 / 20</gadget>
<output>20</output>

<gadget id="calculator">200 + 20</gadget>
<output>220</output>

<gadget id="calculator">220 / 2</gadget>
<output>110</output>

<result>110</result>