SOLUTION: Sally can paint a room in 3 hours while it takes Steve 4 hours to paint the same room. How long would it take them to paint the room if they worked together?

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Question 632095: Sally can paint a room in 3 hours while it takes Steve 4 hours to paint the same room. How long would it take them to paint the room if they worked together?
Answer by Edwin McCravy(20054)   (Show Source): You can put this solution on YOUR website!
Sally can paint a room in 3 hours while it takes Steve 4 hours to paint the
same room. How long would it take them to paint the room if they worked
together?


The LCM of 3 hours and 4 hours is 12 hours.  If they worked together for 12

hours Sally would paint 4 rooms while Steve would paint 3 rooms.  So together

they can paint 7 rooms in 12 hours, so they could paint 1 room in 7/12 hours

or 35 minutes.


 

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