college algebra

Find the time for 2 people working together to complete half of a task if it takes them 8 hours and 10 hours to complete the entire task working individually.

Thank you!!!

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asked by jenny
  1. so it takes them 4 hours and 5 hours to complete half the task individually,

    time=1/(1/4 + 1/5)

    time=20/9 hrs

    this comes from the rate equation...

    rate= task/time
    combination rate=task/time1 + task/time2 or the combination rate is the sum of rates.

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