The school organizes excursions. The original plan was to walk 3.8 kilometers per hour and reach the destination in 3 hours. In fact, the original distance was covered in 2.5 hours, how many kilometers per hour was walked on average?
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小时走完了原定路程，平均每小时走了多少千米？
<gadget id="calculator">3 / 2.5</gadget>
<output>1.2</output>

<gadget id="calculator">3.8 * 1.2</gadget>
<output>4.56</output>

<result>4.56</result>