SOLUTION: if sam can paint a house in 2 hours, and James can paint the same house in 4 hours, how long will it take for them to paint the house together?

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Question 391906: if sam can paint a house in 2 hours, and James can paint the same house in 4 hours, how long will it take for them to paint the house together?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
x%281%2F2+%2B+1%2F4+%29+=+1 ==> %283x%29%2F4+=+1 ==> x = 4/3 hours, or 1 hr and 20 minutes working together.