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答:小軍每小時行12千米,比小華每小時多行3千米,所以:小華每小時行12 - 3 = 9千米 兩人在距中點3千米處相遇,所以:3 x 2 /(12-9)=2(小時) 所以總路程=2x(12 +9)=42(千米)
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