SOLUTION: if alex paints a room in 4 hours & frank paints the same room in 7 hours, how much time would it take to paint the room if both of them worked together?

SOLUTION: if alex paints a room in 4 hours & frank paints the same room in 7 hours, how much time would it take to paint the room if both of them worked together?

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Question 916612: if alex paints a room in 4 hours & frank paints the same room in 7 hours, how much time would it take to paint the room if both of them worked together?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

7x+ 4x = 28
11x = 28
x = 28/11 0r 2 6/11 hr
...
And..checking
11/28 = 1/x
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