algebra

posted by .

Jack usually mows his lawn in 6 hours. Marilyn can mow the same lawn in 5 hours How much time would it take them to mow the lawn together?

  • algebra -

    In 30 hours, Jack mows 5 lawns, and Marilyn can mow 6 lawns.

    That is 11 lawns in 30 hours.

    rate=11/30 lawns/hr.

    so one lawn will take 30/11 hrs.

  • algebra -

    Jack's rate = job/6
    Marilyn's rate = job/5

    their combined rate = job/6 + job/5
    = 11job/30

    job = rate x time

    so time for combined effort = job/rate
    = job/(11job/30)
    = 30/11
    So it takes 30/11 hours
    = 2 8/11 hours

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Algebra

    Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 7 hours. How much time could it take for them to mow the lawn together?
  2. algebra

    Jack usually mows his law in 5 hours. Marilyn can mow the same law in 6 hours. How much time would it take for them to mow the lawn together?
  3. Math

    Jack usually mows his lawn in three hours. Marilyn can mow the same yard in 5 hours. How much time would it take for them to mow the lawn together?
  4. Algebra II

    Jack usually mows his lawn in 6 hours. Marilyn can mow the same lawn in 7 hours. How long would it take if they were both working together?
  5. algebra

    Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 5 hours. How much time would it take for them to mow the lawn together?
  6. math

    Jack usually mows his lawn in 4 hours. Marilyn can mow the same in 5 hours. How much time would it take for them to mow the lawn together?
  7. math/117

    Jack usually mowes his lawn in 7 hours. Marilyn can mow the same yard in 4 hours. How musch time would it take for them to mow the lawn together?
  8. algebra

    jack usually mows his lawn in 4 hours mariltn can mow the same yard in 7 hours how much time would it take for them to mow the lawn together
  9. algebra

    Jack usually mows his lawn in 4hrs Marilyn can mow the same yard in 3hrs. how much time it would take for them to mow the lawn together.
  10. MATH

    Jack usually mows his lawn in 3 hours. Marilyn can mow the same yard in 5 hours. How long would it take them to mow the lawn together?

More Similar Questions