8km÷40km/h=8km÷(40km÷60min)=6min

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8km÷40km/h=8km÷(40km÷60min)=6min
8km÷40km/h=8km÷(40km÷60min)=6min

8km÷40km/h=8km÷(40km÷60min)=6min
不对.
8km÷(40km÷60min)=8km÷40km*60min=12min