Xiao Ming and Xiao Hong set off from places A and B respectively at the same time and walk towards each other. They met in 3.1 minutes. When they met, Xiao Ming exceeded the midpoint by 12.4 meters. It is already known that Xiao Ming walks 54 meters per minute, how many meters does Xiao Hong walk per minute?
小明和小红两人分别从A、B两地同时出发，相对而行．3.1分钟相遇，相遇时，小明超过中点12.4米．已经知道小明每分钟走54米，小红每分钟走多少米？
<gadget id="calculator">54 * 3.1</gadget>
<output>167.4</output>

<gadget id="calculator">12.4 * 2</gadget>
<output>24.8</output>

<gadget id="calculator">167.4 - 24.8</gadget>
<output>142.6</output>

<gadget id="calculator">142.6 / 3.1</gadget>
<output>46</output>

<result>46</result>