SOLUTION: Helper A can do cleaning of a room in 30 minutes. Helper B can do it in 20 minutes. Both helpers are needed to clean the room. How much time they will speed in the process?

Question 1063047: Helper A can do cleaning of a room in 30 minutes. Helper B can do it in 20 minutes. Both helpers are needed to clean the room. How much time they will speed in the process?
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
working together Helper A and B will take x minutes, then
:
(1/30) + (1/20) = (1/x)
:
multiply both sides of the = by 60
:
2 + 3 = 60/x
:
5x = 60
:
x = 12
:
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Working together Helper A and B take 12 minutes
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