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?

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(52785) (Show Source): You can put this solution on YOUR website!
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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.

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