园艺工人需要在下图所示公园的边上种2种类型的景观树，现需要将40棵五角枫从 A地运往B地，60棵国槐从C地运往Z)地。已知4地有20辆卡车，卡车每次只能运送1棵树， 问:想要完成运输任务,20辆卡车至少需要行驶多少米？ 

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