Question

Sandra can paint a kitchen in 3 hours and Charles can paint the same kitchen in 5 hours. How long would it take for both working together to paint the kitchen?
a. 4 hour
b. 8/15 hr
c. 1 7/8 hr
d. 8 hr

Answer 1

Sandy can get 1/3 of the job done each hour.
Chuck can get 1/5 of the job done each hour.
Let's say that together it takes them x hours.
That would mean that together they can get 1/x of the job done each hour.
So we have: The part Sandy does + the part Chuck does = part they do together.
\[\frac{1}{3}+\frac{1}{5}=\frac{1}{x}\]

Answer 2

Thank you!

Answer 3

yw