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?

  1. 👍 0
  2. 👎 0
  3. 👁 51
asked by pam
  1. Jack's rate alone = 1/3
    Marilyn's rate = 1/5
    combined rate = 1/3 + 1/5 = 8/15

    time at combined rate = 1/(8/15) = 15/8 = 1.875 hrs
    or 1 hour and appr 53 minutes

    1. 👍 0
    2. 👎 0
    posted by Reiny
  2. 4 hours

    1. 👍 0
    2. 👎 0
    posted by G

Respond to this Question

First Name

Your Response

Similar Questions

  1. 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?

    asked by Roberto on August 12, 2010
  2. 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?

    asked by KC on March 4, 2008
  3. 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?

    asked by Valentine on April 21, 2011
  4. 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.

    asked by Randy on June 1, 2012
  5. algebra

    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?

    asked by anxious on May 4, 2009
  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?

    asked by Mary on April 24, 2011
  7. algebra

    1. Find the variation constant and and an equation of variation where y varies directly as x and y y=42 when x=6 variation constant is K= equation of variation is y= 2.Jack usually mows his lawn in 6 hours. Marilyn can mow the

    asked by Pinky P on January 3, 2012
  8. 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?

    asked by Anonymous J on October 23, 2010
  9. 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?

    asked by Angela on December 4, 2011
  10. 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

    asked by karon on December 13, 2011

More Similar Questions