Lili rides a bicycle and Junjun walks. They start from two places 2400 meters apart at the same time, walk towards each other, and meet after 6 minutes. Lili's cycling speed is 350 m/min, what is Junjun's walking speed?
丽丽骑自行车，君君步行，两人同时从相距2400米的两地出发，相向而行，经过6分钟相遇．丽丽骑车的速度是350米/分钟，君君步行的速度是多少？
<gadget id="calculator">2_400 / 6</gadget>
<output>400</output>

<gadget id="calculator">400 - 350</gadget>
<output>50</output>

<result>50</result>