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流速が毎時8kmの川の上流と下流にある2地点を船で往復する。船の下りは流れにのり、静水時での通常の速さで運行したが、上りは静水時での通常の速さの1.5倍で運行して往復。しかし、それでも上る時に要した時間が、下る時に要する時間の2倍かかった。船の静水時での通常の速さは？

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