SOLUTION: ali can do a job in 9 hr, while susan can do the same job in 5 hr. how long would it take them to do the job if they worked together?

Question 926098: ali can do a job in 9 hr, while susan can do the same job in 5 hr. how long would it take them to do the job if they worked together?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = ali work rate (jobs/hr)
y = susan work rate (jobs/hr)
---
rate = work/time
time = work/rate
---
rate working together:
x + y = 1/9 + 1/5
---
time working together:
time = 1/(x + y) = 1/( 1/9 + 1/5 )
---
answer:
time = 3.21428571429 hours
---
Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
---
Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
---
Convert fractions, decimals, and percents:
https://sooeet.com/math/fraction-decimal-percent.php
---
Calculate and graph the linear regression of any data set:
https://sooeet.com/math/linear-regression.php
RELATED QUESTIONS
johnny can do a job in 6 hours. jeffrey can do the same job in 9 hours. how long would it (answered by ewatrrr)

Joy can do a job in 7 hours, while it takes Lucy only 5 hours to do same job. How long... (answered by ankor@dixie-net.com)

Mr. Reyes estimates he can do a job in 12 hours while Mr. Tan estimates he can do the... (answered by edjones)

George can do a certain job in 70 minutes while Abe can do the same job in 30 minutes.... (answered by nerdybill)

Show all pertinent solution: A student can do an encoding job for 10 minutes while... (answered by josmiceli)

Working together, two people can cut a large lawn in 5 hr. One person can do the job... (answered by JulietG)

Working together, two people can cut a large lawn in 5 hr. One person can do the... (answered by josmiceli)

A painter Can finish painting a house in 4 hours. Her assistant takes 6 hours to finish... (answered by scott8148)

Working together, Rick & Juanita can complete a job in 6 hr. It would take Rick 9 hr... (answered by dabanfield)