Question: An engineer and his helper can do a certain job in 3 hours. On a given day, they work together for 1 hour then the

An engineer and his helper can do a certain job in 3 hours. On a given day, they work together for 1 hour then the helper left and the engineer finishes the rest of the work in 8 more hours. How long will it take for the engineer to do the job alone?

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