SOLUTION: Peter can paint a room in 5.5 hours. His brother can do the same job in 7.5 hours. How long will it take them to paint the room together?

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Question 1168536: Peter can paint a room in 5.5 hours. His brother can do the same job in 7.5 hours. How long
will it take them to paint the room together?
Answer by ikleyn(52752) About Me  (Show Source):
You can put this solution on YOUR website!
.

With such ugly numbers, it makes no sense to explain the procedure of solution.


Use the final formula  T = 1%2F%281%2F5.5+%2B+1%2F7.5%29.


If you can not compute it mentally, use your calculator.