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algebra

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Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 5 hours. How much time would it take for them to mow the lawn together?

  • algebra -

    1/t= 1/4 + 1/5,
    1/t = 5/20 + 4/20 = 9/20,
    t = 20/9 = 2.2 hours.

    Or
    t = 4*5 / (4+5) = 20/9 = 2.2 hours.

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