Two people, A and B, run around a runway with a circumference of 400 meters. If they start from the same place and run with their backs facing each other, they will meet after 2 minutes; When people meet, it is known that A's speed is faster than B's, how many meters A runs per minute.
甲乙二人环绕周长是400米的跑道跑步，如果两人从同一地点出发背向而行，那么经过2分钟两人相遇；如果两人从同一地点出发同向而行，那么经过20分钟两人相遇，已知甲的速度比乙的速度快，甲每分钟跑多少米．
<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>