SOLUTION: Jack usually mows his lawn in 5 hours, Marilyn can mow the same lawn in 4 hours. How much time would it take for them to mow the lawn together.
They could mow the lawn in _?_ h
Algebra.Com
Question 347781: Jack usually mows his lawn in 5 hours, Marilyn can mow the same lawn in 4 hours. How much time would it take for them to mow the lawn together.
They could mow the lawn in _?_ hours if they worked together.
Found 2 solutions by stanbon, josmiceli:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Jack usually mows his lawn in 5 hours, Marilyn can mow the same lawn in 4 hours. How much time would it take for them to mow the lawn together.
They could mow the lawn in _?_ hours if they worked together.
---
Jack rate: 1/5 job/hr
Marilyn rate: 1/4 job/hr
-----
Together rate: 1/x job/hr
-----
Equation:
rate + rate = together rate
1/5 + 1/4 = 1/x
---
Multiply thru 20x to get:
4x + 5x = 20
---
9x = 20
x = 20/9
x = 2 2/9 hrs (time to do the job together)
================================================
Cheers,
Stan H.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of mowing to get the rate mowing together
Jack's rate: 1 lawn/5 hrs
Marilyn's rate: 1 lawn/4 hrs
Rate working together = 1 lawn/x hrs
multiply both sides by
hrs
This is about 2 hrs and 13 min
RELATED QUESTIONS
Jack usually mows his lawn in 5 hours. Marilyn can mow the same yard in 4 hours. How much (answered by mananth)
Jack usually mows his lawn in 7 hours. Marilyn can mow the same yard in 5 hours. How much (answered by dabanfield,Alan3354)
Jack usually mows his lawn in 5 hours. Marilyn can mow the same lawn is 3 hours. How much (answered by solver91311)
Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 5 hours. How... (answered by nerdybill)
Jack usually mows his lawn in 3 hours. Marilyn can mow the same lawn in 5 hours. How... (answered by mananth)
Jack usually mows his lawn in 3 hours. Marilyn can mow the same yard in 5 hours. How much (answered by stanbon,CharlesG2)
Jack usually mows his lawn in 5 hours. Marilyn can mow the same yard in 6 hours. How much (answered by unlockmath)
Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 6 hours. How... (answered by LarsJongste,slim522)
Jack usually mows his lawn in 3 hours. Marilyn can mow the same yard in 4 hours. How much (answered by solver91311)
Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 6 hours.
How... (answered by robertb)