SOLUTION: It takes you 15 minutes to wash a car and it takes a friend 6 minutes to wash a car. How long does it take the two of you to wash 7 cars if you work together?
Algebra ->
Rate-of-work-word-problems
-> SOLUTION: It takes you 15 minutes to wash a car and it takes a friend 6 minutes to wash a car. How long does it take the two of you to wash 7 cars if you work together?
Log On
Question 340038: It takes you 15 minutes to wash a car and it takes a friend 6 minutes to wash a car. How long does it take the two of you to wash 7 cars if you work together? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! It will take the both of you working together
7 times as long as it takes the both of you
together to wash 1 car
In words:
(your rate) + (friend's rate) = (rate working together)
Let = minutes it takes with both working
Multiply both sides by
This is the time it takes both working together to wash 1 car
For 7 cars, multiply by
It will take 30 min
