SOLUTION: Jack can paint a room in 5 hours, joe can paint the same room in 9 hours. Working together how long will it take to plant the same room

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Question 875961: Jack can paint a room in 5 hours, joe can paint the same room in 9 hours. Working together how long will it take to plant the same room
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

1%2F5+%2B+1%2F9+=+1%2Fx |Multiplying thru by 45x so as all denominators = 1

   9x + 5x = 45

   14x = 45

     x = 48/14 = 24/7  0r 3 3/7 hr