SOLUTION: Working together Ben and Frank wash 1,000 dishes in 3 hours. Ben works twice as fast as Frank. How lon does it take Frank to wash dishes alone?
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Question 1112619: Working together Ben and Frank wash 1,000 dishes in 3 hours. Ben works twice as fast as Frank. How lon does it take Frank to wash dishes alone? Answer by ikleyn(52784) (Show Source):
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Solve for x
Working together Ben and Frank wash 1,000 dishes in 3 hours. Ben works twice as fast as Frank.
How long does it take Frank to wash dishes alone?
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Ben alone works as two Francs.
So, you can re-formulate the problem in this way:
Three Francs make a job in 3 hours.
How long does it take Frank to make this job alone ?
As soon as you re-formulated it, the answer is obvious: It will take 9 hours.
