The length of a track on a sports field is 400 meters. A practices cycling at an average of 350 meters per minute, and B practices running. The two started from the same place at the same time in opposite directions and met after 48 seconds. How many meters does B run per minute?
运动场的跑道一圈长400米．甲练习骑自行车，平均每分骑350米，乙练习跑步．两人从同一处同时向反方向出发，经过48秒相遇．乙每分钟跑多少米？
<gadget id="calculator">50 - 35</gadget>
<output>15</output>

<result>15</result>