• Accueil
  • Math
  • One secretary can do a particular typing job in 5...

One secretary can do a particular typing job in 5 hour and other secretary can do the same job 4 hour. how many hours will take if the job is done by the two secretaries working together?

Answers

  • Réponse publiée par: enrica11
    It will take 2 ²/₉ hours to do the same job when working together.

    More people working on the same job lessens the number of working hours than when a person works alone.

    Step-by-step explanation:

    Work Rate:

    First secretary: 1/5

    Second secretary: 1/4

    The job: 1 (typing job)

    Number of hours to finish the job: x hours

    Working together: 1/x

    Equation:

    1/5 + 1/4 = 1/x

    LCD: (4)(5)(x)

    (4)(5)(x) [1/5 + 1/4 = 1/x] (4)(5)(x)

    4x + 5x = 20

    9x = 20

    9x/9 = 20/9

    x = 20/9

    x = 2 ²/₉ hours
  • Réponse publiée par: 09389706948
    Hatnvdhn ajsmsiams sismsjsl sinsn
Connaissez-vous la bonne réponse?
One secretary can do a particular typing job in 5 hour and other secretary can do the same job 4 hou...