SOLUTION: I have another question - Bert and Ernie working together can rake a lawn in 3 hours. Bert can do the job alone in 5 hours. How long would it take Ernie to rake the lawn alone?
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Question 227576: I have another question - Bert and Ernie working together can rake a lawn in 3 hours. Bert can do the job alone in 5 hours. How long would it take Ernie to rake the lawn alone? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! In words:
(Bert's rate of working) + (Ernie's rate of working) = (rate working together)
(1 lawn/5 hours) + (1 lawn/x hours) = 1 lawn/3 hours)
Multiply both sides by
Ernie can rake the lawn alone in 7.5 hours
check:
OK
