algebra
posted by loulou .
frank can wash the car in 2/3 the time his younger brother,joe,can wash the car.they worked together and washed the car in 40 minutes.how long would it have taken each boy working separately?

X min. = Joe's time.
2x/3 = Frank's time.
1/x + 3/2x = 1/40
Multiply both sides by 2x:
2 + 3 = x/20
x/20 = 5
X = 100 min. = Joe's time.
2x/3=200/3 = 66.67 min. = Frank's time.
Respond to this Question
Similar Questions

Critical Thinking
Need help with identifying argument and reasoning for Having your car washed at the carwash may be the best way to go, but there are some possible drawbacks. The International Carwashing Association (ICA) has fought back against charges … 
math
Megan and Sam together take 12 minutes to wash a car. Washing the car by herself took Megan 21 minutes. How long would it take Sam to wash the car? 
math
Jack and Jill wash a car at the same rate . Working together it takes them an hour and 10 minutes to wash a car. One day jack started washing a car by himself at 2:30 p m. When he was half way done , Jill joined him . What time did … 
Algebra 1
Mr. Jones got his car washed at super clean. The wash started at 1:55pm and ended at 2:05pm. It cost $7. Mr. Smith got his car washed at Super Clean for $12. the wash started at 9:30am and ended at 9:50 am. Write an equation for the … 
math
A group of students have volunteered for the student council car wash. Janet can wash a car in m minutes. Rodrigs can wash a car in m5 minutes, while Nick needs the same amount of time as Janet.If they all work together, they can … 
algebra
How is this problem solved? It takes Bobby 60 minutes longer to wax the car than it does his brother Kevin. Together it takes them 50 minutes to wax the car. How long does it take each working separately? 
Algebra
Evan washes two types of vehicles. It takes him 30 minutes to wash a car and 40 minutes to wash a truck. He charges $12 to wash a car and $15 to wash a truck. In 270 minutes, Evan made $105 washing cars and trucks. How many trucks … 
mohale
Kwaito enrolled at university of johannesburg, his family gives him a pocket money that doesn't last for a month. So he decided to work at Ramodumo car wash next to his campus to make extra cash. A car wash agrees to pay him R55.00 … 
algebra 21
Evan washes two types of vehicles. It takes him 30 minutes to wash a car and 40 minutes to wash a truck. He charges $12 to wash a car and $15 to wash a truck. In 270 minutes, Evan made $105 washing cars and trucks. How many trucks … 
Math
Good evening everyone. I am very confused on how to work on the below problem. Ingrid walked her dog and washed her car. The time she spent walking her dog was 1/4 the time it took to wash her car. It took Ingrid 14 minutes to walk …