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Mike can complete a project in 60 minutes͵ and if Mike and Walter both work on the project͵ they can complete it in 40 minutes. How long will it take Walter to complete the project by himself?

  • Math - ,

    Mike (1/60) project/min

    Walter (w project/min)

    together

    (1 + 60 w)/60 project /min

    [(1+60 w)/60 ] 40 = 1 project

    1 + 60 w = 6/4

    60 w = .5

    w = .0083333

    1/w = min/project = 120 minutes

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