Math

posted by .

if jack can mow his lawn in 4 hours and sue can mow the same lawn in 7 hrs how much time if they both mowed the lawn together???

• Math -

Jack's rate = 1/4
Sue's rte = 1/7
combined rate = 1/4 + 1/7 = 11/28

combined time = 1/(11/28) = 28/11 = 2.5454..
or 2 hrs, 33 minutes (appr for minutes)

• Math -

Thanks for showing me.

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. 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. Math

Mike can mow a lawn in 3 hours. Paul can mow the same lawn in 2 hours. How long would it take both of them working together to mow the lawn?
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. 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
8. Math

if jack can mow his lawn in 4 hours and sue can mow the same lawn in 7 hrs how much time if they both mowed the lawn together?
9. Math

if jack can mow his lawn in 4 hours and sue can mow the same lawn in 7 hrs how much time if they both mowed the lawn together?
10. math

Abe can mow the lawn in 15 minutes.Ben can mow the lawn in 20 minutes.Carl can mow the lawn in 30 minutes.They work together for 5 minutes.What part of the lawn was mowed?

More Similar Questions