Question 11355
In 1 hr Sally can paint 1/4
John can paint 1/6 in 1hr.
Combined, they will paint in 1/4 + 1/6
Taking LCM
6+4/24  = 10/24 = 5/12
Therefore total time they will take is 12/5 = 2hrs + 2/5x60 mins = 2hr 24 mins