SOLUTION: If my friend has to paint a room for 1 hour .
And if i have to paint the same size of room
it will take 2 hours . How long we have to
paint the room if we are to paint it
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Algebra.Com
Question 962234: If my friend has to paint a room for 1 hour .
And if i have to paint the same size of room
it will take 2 hours . How long we have to
paint the room if we are to paint it
together?
Found 2 solutions by josgarithmetic, lwsshak3:
Answer by josgarithmetic(39631) (Show Source): You can put this solution on YOUR website!
Your rate when both of you work together is additive.
That is 3 rooms in 2 hours,
or
1 room in 2/3 hours.
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
If my friend has to paint a room for 1 hour .
And if i have to paint the same size of room
it will take 2 hours . How long we have to
paint the room if we are to paint it
together?
***
my friend has to paint a room for 1 hour
his work rate=1/1=1
I can paint a room in 2 hours
my work rate=1/2
together we can paint the room in x hours
our work rate=1/x
..
sum of indv. work rates= work rate working together
1+1/2=1/x
3/2=1/x
x=2/3
How long we have to
paint the room if we are to paint it
together? 2/3 hr or 40 min
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