A car traveled 23 kilometers more in the morning than in the afternoon. You drive for 4 hours in the morning and 3.5 hours in the afternoon, how many kilometers per hour are you driving on average?
一辆汽车上午比下午多行驶了23千米．上午行驶了4小时，下午行驶了3.5小时，平均每小时行驶多少千米？
<gadget id="calculator">4 - 3.5</gadget>
<output>0.5</output>

<gadget id="calculator">23 / 0.5</gadget>
<output>46</output>

<result>46</result>