SOLUTION: Working alone Mandy can complete a project in 7 hours. It would take Colin 3 hours to complete the same project. If they work together, how long will it take them to complete the p

Question 892418: Working alone Mandy can complete a project in 7 hours. It would take Colin 3 hours to complete the same project. If they work together, how long will it take them to complete the project?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Ad their rates of working
Mandy's rate:
( 1 project ) / ( 7 hrs )
Colin's rate:
( 1 project ) / ( 3 hrs )
---------------------
Let = time to finish project
if they work together

Multiply both sides by

hrs
Convert hrs to min
min
------------------
Working together, it will take
them 2 hrs and 6 min

RELATED QUESTIONS
Anthony and Donita can complete a project in 21/5 hours. It takes Donita 14 hours to do... (answered by rapaljer)

Supposed Amy can complete a typing project in 6 hours while Cynthia can complete it in 4... (answered by josgarithmetic)

When working together worker A and worker B take 8 hours to complete a project.Today they (answered by ankor@dixie-net.com)

Two scientists are working on a special project. The experienced scientist can complete... (answered by stanbon)

it takes robert and william 12 hours to complete a history project. If Robert works alone (answered by josgarithmetic)

If x people can work together at the same rate to complete a project in y hours, what... (answered by Okamiden)

Andrew takes eighteen hours to complete a certain project alone. he had worked six hours... (answered by ankor@dixie-net.com)

It takes Maria twice as long to complete a certain type of research project as it takes... (answered by oberobic)

if i can compleate a science project alone in 9 hours, and you compleate the same project (answered by jorel1380)