and B walk from the same place in opposite directions at the same time. After 3.5 hours, the distance between them is 33.25 kilometers. A walks 5 kilometers per hour, how many kilometers does B walk per hour?
甲乙两人同时从同一地点向相反方向行走，3.5小时后两人相距33.25千米．甲每小时行走5千米，乙每小时行走多少千米？
<gadget id="calculator">33.25 / 3.5</gadget>
<output>9.5</output>

<gadget id="calculator">9.5 - 5</gadget>
<output>4.5</output>

<result>4.5</result>