SOLUTION: Working alone, Leo can clean the windows in the living room in 30 minutes; it would take Margaret 20 minutes to do the same task. How long would it take them working together?
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Question 1005970: Working alone, Leo can clean the windows in the living room in 30 minutes; it would take Margaret 20 minutes to do the same task. How long would it take them working together? Found 2 solutions by fractalier, Alan3354:Answer by fractalier(6550) (Show Source):
You can put this solution on YOUR website! The set up looks like this
t/20 + t/30 = 1
Multiply by 60 and get
3t + 2t = 60
5t = 60
t = 12 minutes working together
You can put this solution on YOUR website! Working alone, Leo can clean the windows in the living room in 30 minutes; it would take Margaret 20 minutes to do the same task. How long would it take them working together?
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Leo cleans 1/30 of a window per minute.
Mar cleans 1/20 of a window per minute.
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Together, they clean 1/30 + 1/20 per minute.
= 50/600 = 1/12 window per minute
--> 12 min/window
