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March 27, 2017

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tom can mow a lawn in 4 hours. perry can mow the same lawn in 5 hours. how long for them to mow the lawn together?

  • Math - ,

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  • smith - ,

    (1/4)+(1/5)=9/20
    Then in one hour they can do 20/9
    60*20/9= 133 minutes

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