Four men can build four boats in four days.how long will it take one man to build one boat?

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Four men can build four boats in four days.how long will it take one man to build one boat?

Four men can build four boats in four days.how long will it take one man to build one boat?
Four men can build four boats in four days.how long will it take one man to build one boat?

Four men can build four boats in four days.how long will it take one man to build one boat?
Four day 4个男人 4天能造4只船 则每个男人造1只船为4天