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pre calc

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it takes my father 3 hours to plow our cornfield with his new tractor using the old tractor it takes me 5 hours. if we both plow for 1 hour before i go to school, how long will it take dad to finish the plowing.

I got 2.5 hours but i think that is totally wrong?????

  • pre calc -

    combined rate=field/3hrs + field/5hrs

    time=field/(field/3 + field/5)
    time= 15/(8)= less than your time.

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