SOLUTION: Frank can type a report in 2hrs and james takes 5hrs. How long does it take them together?

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Question 32402: Frank can type a report in 2hrs and james takes 5hrs. How long does it take them together?
Answer by mukhopadhyay(490) About Me  (Show Source):
You can put this solution on YOUR website!
Assume they take t hours to finish together
Potion of work done by Frank in t hours = t/2;
Potion of work done by James in t hours = t/5;
Together they complete the entire job (1 job)
=> t/2 + t/5 = 1
=> 7t/10 = 1
=> t = 10/7 hours
Answer: 1 and 3/7 hours