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It takes Sarah 6 hrs longer to paint a room than it takes John. Working together, they can paint the room in 4 hours. How long in hours) would it take Sarah to paint the room alone?

 Feb 9, 2020
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Let John's hourly rate =j
Sarah's hourly rate      =j + 6
1/j + 1/(j+6) = 1/4, solve for j
j = 6 hours - time that John needs to paint the room by himself.
6 + 6 = 12 hours - time that Sarah needs to paint the room by herself.

 Feb 9, 2020

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