It took Huahua 5 minutes to go uphill, with an average of 45 meters per minute, and 4 minutes to go downhill, with an average of 63 meters per minute. How many meters does Huahua walk from home to the amusement palace on average per minute?
华华从家到游乐宫去，上坡用了5分钟，平均每分钟走45米；下坡用了4分钟，平均每分钟走63米．华华从家到游乐宫平均每分钟走多少米？
<gadget id="calculator">45 * 5</gadget>
<output>225</output>

<gadget id="calculator">63 * 4</gadget>
<output>252</output>

<gadget id="calculator">225 + 252</gadget>
<output>477</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">477 / 9</gadget>
<output>53</output>

<result>53</result>