At 8 o'clock in the morning, A and B start from two places 180 kilometers apart and walk towards each other at the same time. By 12 noon, the distance between the two is 40 kilometers. It is known that A travels an average of 16.5 kilometers per hour, and B Average miles per hour?
上午8点，甲、乙两人分别从相距180千米的两地同时出发相向而行，到中午12点时，两人还相距40千米，已知甲平均每小时行16.5千米，乙平均每小时行多少千米？
<gadget id="calculator">140 / 4</gadget>
<output>35</output>

<gadget id="calculator">35 - 16.5</gadget>
<output>18.5</output>

<result>18.5</result>