A and B are practicing race walking on a 400-meter-long circular track. They walk backwards from the same starting point at the same time. A walks 62 meters per minute. After 2 minutes, the two meet. How many meters per minute does B walk?
甲、乙两人在400米长的环形跑道上练习竞走，从同一出发点同时背向而行，甲每分钟走62米，2分钟后两人相遇，乙每分钟走多少米？
<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<gadget id="calculator">200 - 62</gadget>
<output>138</output>

<result>138</result>