Xiaoming went hiking with his classmates on weekends. The distance from the bottom of the mountain to the top of the mountain is 6.6km. It took 3 hours to go up the mountain and 2.5 hours to go down the mountain. What is the difference between the speed of going up the mountain and going down the mountain?
小明周末和同学去登山，从山底到山顶的路程是6.6km，上山用了3小时，下山用了2.5小时，上山和下山的速度相差多少？
<gadget id="calculator">6.6 / 2.5</gadget>
<output>2.64</output>

<gadget id="calculator">6.6 / 3</gadget>
<output>2.2</output>

<gadget id="calculator">2.64 - 2.2</gadget>
<output>0.44</output>

<result>0.44</result>