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Jack usually mows his lawn in 4hrs Marilyn can mow the same yard in 3hrs. how much time it would take for them to mow the lawn together.

  • algebra -

    Each hour Jack mows 1/4 of the lawn.
    Marilyn mows 1/3 of the lawn.

    Together, each hour they mow 1/4+1/3=7/12 of the lawn.
    How long would it take to mow the whole lawn:
    x/1 = 7/12
    Cross multiply to find x.

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