The distance between A and B is 200 meters. A and B are walking from A and B at the same time. After 9 minutes, the distance between the two is 884 meters. It is known that A’s speed is 40 meters per minute. Find B speed.
A、B两地相距200米，甲、乙两人分别从A、B两地同时背向而行，9分钟后、两人相距884米，已知甲的速度是40米/分，求乙的速度．
<gadget id="calculator">884 - 200</gadget>
<output>684</output>

<gadget id="calculator">684 / 9</gadget>
<output>76</output>

<gadget id="calculator">76 - 40</gadget>
<output>36</output>

<result>36</result>