math

posted by .

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?

  • math -

    From the time it takes to do the complete joh, calculate the time it takes to do per hour. The resulting rate can then be added to find the time it takes for both of them.

    1/(1/4+1/5)=1/(9/20)=20/9=2 2/9 hours.

  • math -

    the time t that it takes for a salesman to drive a certain distance d varies inversely as the average speed r . it takes the salesman 4.75 h to travel between two cities at 60 mi/h . how long would the drive take ?

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 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?
  3. 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?
  4. 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?
  5. 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?
  6. 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?
  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