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math/117

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Jack usually mowes his lawn in 7 hours. Marilyn can mow the same yard in 4 hours. How musch time would it take for them to mow the lawn together?

  • math/117 -

    3 hrs

  • math/117 -

    jack mows (1/7) lawn per hour
    marilyn mows (1/4) yard per hour

    together they mow 1/7 + 1/4 yard per hour
    = 4/28 + 7/28 = 11/28 yards per hour
    so
    28/11 = about 2.54 hours/yard

  • math/117 -

    Which one is the answer? 3 or 2.54?

  • math/117 -

    Damon's answer is correct.

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