Students from a certain school participated in field survival training. They originally planned to walk 11.25 kilometers in 3 hours. They actually completed the planned 3-hour distance in 2 hours. On average, how much more kilometers did they walk per hour than the original plan?
某校学生参加野外生存训练，原计划3小时走11.25千米，实际2小时走完原定3小时走的路程，平均每小时比原计划多走多少千米．
<gadget id="calculator">11.25 / 2</gadget>
<output>5.625</output>

<gadget id="calculator">11.25 / 3</gadget>
<output>3.75</output>

<gadget id="calculator">5.625 - 3.75</gadget>
<output>1.875</output>

<result>1.875</result>