The road from the foot of the mountain to the top of the mountain is 3000 meters long. It took Xiaohua 40 minutes to go up the mountain and 30 minutes to go down the mountain along the original road. On average, how many meters per minute is Xiaohua going down the mountain faster than going up the mountain?
从山脚到山顶的路长为3000米，小华上山用了40分钟，沿原路下山用了30分钟．小华下山比上山平均每分钟快多少米？
<gadget id="calculator">3_000 / 30</gadget>
<output>100</output>

<gadget id="calculator">3_000 / 40</gadget>
<output>75</output>

<gadget id="calculator">100 - 75</gadget>
<output>25</output>

<result>25</result>