SOLUTION: Two brothers took turns washing the family car on weekends. John could usually wash the car in 45 min., whereas Jim took 30 min. for the job. One weekend they were in a hurry to o
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Question 657311: Two brothers took turns washing the family car on weekends. John could usually wash the car in 45 min., whereas Jim took 30 min. for the job. One weekend they were in a hurry to o to a basketball game, so they worked together. How long did it take them to wash the car together?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
John's rate was ( 1 car washed ) / ( 45 min )
Jim's rate was ( 1 car washed ) / ( 30 min )
Add their rates to get rate working together
Let = their time working together
Multiply both sides by
It took them 18 min working together
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