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Math Help - work problem

  1. #1
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    Question work problem

    I really need the problem below solved, however it's not as easy as it looks so leave a explanation with your answer. (ps: it's not over 20, that I know)



    I can mow the lawn in 30 minutes, my husband can mow the lawn in 20 minutes. If we got two lawnmowers and did the lawn together how long would it take?
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  2. #2
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    Quote Originally Posted by gamecube145 View Post
    I really need the problem below solved, however it's not as easy as it looks so leave a explanation with your answer. (ps: it's not over 20, that I know)



    I can mow the lawn in 30 minutes, my husband can mow the lawn in 20 minutes. If we got two lawnmowers and did the lawn together how long would it take?
    You mow 1/30 of a lawn per min, your husband mows 1/20 of the lawn per min.

    In x minites together you mow:

    m=x/30+x/20

    And if m=1 (the whole lawn), then:

    2.5 x = 30

    x=?? minutes

    RonL
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