The school organizes hiking activities. The original plan is to walk 3.8 kilometers per hour and reach the destination in 3 hours. The actual journey is completed in 2.5 hours. How much more kilometers per hour is the average? (answer with ratio)
学校组织远足活动，原计划每小时走3.8千米，3小时到达目的地，实际2.5小时行完全程，平均每小时多行多少千米？(用比例解答)
<gadget id="calculator">3.8 * 3</gadget>
<output>11.4</output>

<gadget id="calculator">11.4 / 2.5</gadget>
<output>4.56</output>

<result>4.56</result>