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Mathematics 6 Online
OpenStudy (anonymous):

a barge approaches the pier by a cable attached to a barge in the floor of it; cable is encoiled with a winch located on the deck of the barge, at a rate of 4.4m. per minute. The cover is 4.5m. below the quay. How quickly you move the barge to the dock when it is far from 6 m.?

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