SOLUTION: frank can complete a job in 5 hours. Joe can do it in 8 hours. After frank has worked for 2 hours, Joe was asked to help Frank complete the job. In how many hours after Joe has sta

Question 902560: frank can complete a job in 5 hours. Joe can do it in 8 hours. After frank has worked for 2 hours, Joe was asked to help Frank complete the job. In how many hours after Joe has started will they complete the job.
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
Frank and Joe, in their combination of times, are doing 1 whole job.
Let t = time that Joe worked.

If you can understand the equation, that is great. Otherwise, that is what help you need.

Just solve for t.

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