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college algebra

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Lisa can shovel snow from her driveway in 50 min. Jim an do the same job in 55 min.How long would it take Lisa and Jim if they worked together?

  • college algebra -

    lisa's rate = drive/50
    Jim's rate = drive/55
    combined rate = drive/50 + drive/55
    = 21drive/550

    so time = drive/(21drive/550) = 26 minutes

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