The distance between the two places is 200 meters. Two people start from the two places at the same time and walk in opposite directions. After 3 minutes, the distance between the two is 530 meters. A walks 60 meters per minute. How many meters does B walk per minute?
两地间距离是200米，两人从两地同时出发向相反方向而行，3分后两人相距530米，甲每分钟走60米，乙每分钟走多少米？
<gadget id="calculator">530 - 200</gadget>
<output>330</output>

<gadget id="calculator">330 / 3</gadget>
<output>110</output>

<gadget id="calculator">110 - 60</gadget>
<output>50</output>

<result>50</result>