Zhou Peng and Wang Ping rode bicycles at the same time from two places 38 kilometers apart, and met each other in 2 hours. It is known that Zhou Peng travels 8.5 kilometers per hour, how many kilometers per hour does Wang Ping travel?
周鹏和王平两个人骑自行车同时从相距38千米的两地相向而行，2小时相遇，已知周鹏每小时行8.5千米，王平每小时行多少千米？
<gadget id="calculator">38 / 2</gadget>
<output>19</output>

<gadget id="calculator">19 - 8.5</gadget>
<output>10.5</output>

<result>10.5</result>